Pedestal platform for a narrow access compartment of a marine vessel

CN224782271UActive Publication Date: 2026-09-22DALIAN COSCO KHI SHIP ENG
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Patent Information

Application Number
CN202522117424.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-30
Publication Date
2026-09-22
Estimated Expiration
2035-09-30

AI Technical Summary

Technical Problem

[0005]特别的,在入口狭小的舱室内,例如入口只有人孔,舱室内需要永久或临时踏板平台,往往只能切成小件,舱内焊接,施工环境差,焊缝多,不美观,有时会严重影响安装质量

Benefits of technology

[0013]较现有技术相比,本实用新型具有以下优点:该平台结构设计模块化程度高,框架主体通过第一、二、三边框部件及T型中间部件的可拆卸连接组合而成,相邻部件借助凸起与非凸起连接头精准对接,盖板通过螺柱与螺母快速固定,且连接孔数量可根据实际需求灵活调整,大幅降低了狭小舱室空间内的组装难度,便于运输、拆装与后期维护。平台的盖板顶部铺设花纹钢板能有效防滑,底面增设扁钢强化支撑稳定性,同时可通过盖板开孔与无缝钢管配合加装栏杆组件,竖杆与横杆采用圆钢弯折插入式连接,两行栏杆设计进一步提升人员通行防护能力,降低高空坠落风险;铺设时可通过选择第一支撑部件或第二支撑部件,分别实现与舱壁或甲板的稳固连接,且能通过调整第二支撑部件数量灵活调节平台高度,完美适配船舶不同狭小入口舱室的安装场景。平台中凸起连接头可通过冲压或焊接加工,材料易得且加工工艺成熟,整体结构兼顾强度与轻量化,既保证船舶航行中的结构可靠性,又不会过度增加舱室负重,综合提升了船舶狭小空间作业的便利性与安全性。

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Abstract

The utility model provides a kind of narrow entrance cabin's footboard platform for ship, belong to ship design technical field.The device uses the method of multi-module splicing, realizes footboard platform building by the lap joint and bolt connection between each component, set multiple selectable modules to meet the requirement of different site size, footboard platform main body is fixed to deck and bulkhead by base and support component to meet the demand in different scenarios, further can select the cover plate of installable guardrail, realize guardrail installation.The size of each component of the device can smoothly pass through narrow entrance, enter again and connect each component using bolt, can realize the quick disassembly of footboard platform.No need to fire, can be realized in time according to need to increase permanent or temporary footboard platform.
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Description

Technical Field

[0001] This utility model relates to a step platform for a narrow entrance compartment of a ship, belonging to the field of ship design technology. Background Technology

[0002] During the shipbuilding phase, permanent or temporary footboard platforms are sometimes needed near fuel tanks that have already been refueled. Since open flames are prohibited within a certain range around the fuel tanks, the addition is often abandoned, and the footboard platforms are added only after the tanks have been thoroughly cleaned during ship maintenance.

[0003] Document CN 120364076 A discloses an assembled waterborne operation platform. Through the design of frame units and connection structures, multiple frame units can be quickly connected and disassembled, while ensuring a stable connection state, thereby improving the work efficiency of the platform's assembly, disassembly and relocation.

[0004] Document CN 105539769 B discloses a method for erecting scaffolding during the closure stage of the bottom side compartment of a bulk carrier's cargo hold. The method involves pre-assembling the scaffolding in advance during the segmentation stage, and the scaffolding panel can be used in both the segmentation and overall stage, thereby improving the utilization rate of scaffolding equipment.

[0005] In particular, in cabins with narrow entrances, such as those with only a manhole, where permanent or temporary platform steps are needed, the components often have to be cut into smaller pieces and welded inside the cabin. This creates a poor working environment, numerous weld seams, and an unsightly appearance, which can sometimes seriously affect the installation quality. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a step platform for a narrow entrance compartment in a ship. The dimensions of each component can smoothly pass through the narrow entrance, and after entering, the components are connected by bolts, which can realize the quick assembly and disassembly of the step platform.

[0007] The technical solution adopted by this utility model is: a step platform for a narrow entrance compartment of a ship, characterized in that: the step platform includes a step platform body, supporting components, and a base; the step platform body includes a frame body and a cover plate; The main body of the frame comprises a first frame component, a second frame component, and a third frame component. The main body of the frame component is an L-shaped structure. The first frame component has a first protruding connector at both ends. The second frame component has a second protruding connector at one end and a second non-protruding connector at the other end. The third frame component has a third non-protruding connector at both ends. The main body of the frame is a square structure formed by a first wide side, a first long side, a second wide side, and a second long side. A middle support plate is set in the middle of the square structure. The first long side and the second long side are connected by second frame components. Two adjacent second frame components are connected to each other by the second non-protruding connector of one component and the second protruding connector of the other component. The first wide side includes a first border component and a second border component, and two adjacent protruding connectors are provided in the first wide side; the second wide side includes a third border component and a second border component, and two adjacent non-protruding connectors are provided in the second wide side. The intermediate support plate is composed of intermediate components connected together. The intermediate components have a T-shaped structure, with an intermediate component connecting platform at one end and an intermediate component connecting plate at the other end. Two adjacent intermediate components are connected to the intermediate component connecting plate of the other component through the intermediate component connecting platform of one component. One end of the intermediate support plate is the connecting plate end, and the other end is the connecting platform end. The connecting plate end of the middle support plate is connected to the structure adjacent to the two protruding connecting heads in the first wide side, and the connecting platform end of the middle support plate is connected to the structure adjacent to the two non-protruding connecting heads in the second wide side; there are connecting holes on the frame body; The cover plate is a rectangular structure with a patterned steel plate on top and studs on the bottom surface of the patterned steel plate. The cover plate component covers the frame body, and the studs pass through holes in the frame body and are fixed with nuts. Flat steel is provided on the bottom surface of the patterned steel plate and supports the frame body. The support component includes a first support component and a second support component. The main body of the support component adopts an L-shaped structure. The first support component is Z-shaped and has connection holes at both ends. The second support component is I-shaped and has a first plane at one end with connection holes on the first plane. The base body adopts an L-shaped structure, with a second plane at one end that is perpendicular to the main structure and has a larger dimension than the main structure. The base body is provided with connection holes.

[0008] Furthermore, the L-shaped structure is made of angle steel, and the protruding connector is manufactured by stamping or welding.

[0009] Furthermore, the number of connection holes on the main body can be adjusted according to actual needs.

[0010] Furthermore, holes are made on the surface of the cover plate, and seamless steel pipes are welded to the bottom surface of the cover plate.

[0011] Furthermore, the pedal platform also includes a railing assembly, which includes vertical bars and horizontal bars; the vertical bars are made of seamless steel pipes, with auxiliary bars welded onto the main bars; the horizontal bars are composed of a main body and round steel bars bent downwards at 90 degrees at both ends, with the bent round steel bars inserted into the auxiliary bars for connection.

[0012] Furthermore, the railing components are arranged in two rows.

[0013] Compared with existing technologies, this utility model has the following advantages: The platform structure is highly modular. The main frame is assembled by detachable connections of the first, second, and third side frame components and the T-shaped middle component. Adjacent components are precisely connected by protruding and non-protruding connectors. The cover plate is quickly fixed by studs and nuts, and the number of connection holes can be flexibly adjusted according to actual needs, greatly reducing the assembly difficulty in confined spaces and facilitating transportation, disassembly, and subsequent maintenance. The top of the platform cover plate is covered with a patterned steel plate for effective anti-slip, and the bottom surface is reinforced with flat steel to enhance support stability. At the same time, railing components can be added by using seamless steel pipes through openings in the cover plate. The vertical and horizontal bars are connected by bending and inserting round steel. The two-row railing design further enhances the protection of personnel passage and reduces the risk of falls from heights. During installation, the first or second support component can be selected to achieve a stable connection with the bulkhead or deck, and the platform height can be flexibly adjusted by adjusting the number of the second support component, perfectly adapting to the installation scenarios of different confined entrance compartments on ships. The protruding connectors in the platform can be processed by stamping or welding. The materials are readily available and the processing technology is mature. The overall structure takes into account both strength and lightweight, ensuring the structural reliability of the ship during navigation without excessively increasing the load on the cabin, thus comprehensively improving the convenience and safety of operating in the ship's confined space.

[0014] Each component is sized to fit smoothly through the narrow entrance, and bolts are used to connect the components, allowing for quick assembly and disassembly of the pedal platform. No open flame is required, and permanent or temporary pedal platforms can be added as needed. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural diagram of the border component.

[0017] Figure 2 This is a structural diagram of the intermediate component.

[0018] Figure 3 This is a structural diagram of the cover plate.

[0019] Figure 4 This is a structural diagram of the supporting components.

[0020] Figure 5 This is a structural diagram of the base.

[0021] Figure 6 This is a structural diagram of the main frame.

[0022] Figure 7 This is a structural diagram of the main body of the pedal platform.

[0023] Figure 8 This is a schematic diagram of the treadmill platform structure installed on the deck.

[0024] Figure 9 This is a schematic diagram of the footboard platform structure installed on the bulkhead.

[0025] Figure 10 This is a structural diagram of the railing assembly.

[0026] Figure 11 This is a schematic diagram of the installation of the railing components.

[0027] In the diagram: 1. Deck, 2. Bulkhead, 3. Main body of the platform, 4. Supporting component, 5. Base, 30. Cover plate, 31. First frame component, 311. First protruding connector, 32. Second frame component, 321. Second protruding connector, 322. Second non-protruding connector, 33. Third frame component, 331. Third non-protruding connector, 34. Intermediate component, 341. Intermediate component connecting plate, 342. Intermediate component connecting platform, 35. Connecting hole, 36. Railing assembly, 39. Main frame body, 3 91. First wide side; 392. First long side; 393. Second wide side; 394. Second long side; 395. Middle support plate; 40. Second plane; 41. First support component; 42. Second support component; 301. Patterned steel plate; 302. Stud; 303. Nut; 304. Flat steel; 305. Opening; 306. Seamless steel pipe; 361. Vertical bar; 362. Horizontal bar; 420. First plane; 3611. Main bar; 3612. Auxiliary bar; 3621. Horizontal bar body; 3622. Round steel. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Figures 1 to 7 A step platform for a narrow entrance compartment on a ship is shown. The step platform includes a platform body 3, a support component 4, and a base 5. The platform body 3 includes a frame body 39 and a cover plate 30. The frame body 39 is composed of a first side frame component 31, a second side frame component 32, and a third side frame component 33. The main body of the side frame component is L-shaped. The first side frame component 31 has a first protruding connector 311 at both ends. The second side frame component 32 has a second protruding connector 321 at one end and a second non-protruding connector 322 at the other end. The third side frame component 33 has a third non-protruding connector 331 at both ends. The frame body 39 is a square structure formed by a first wide side 391, a first long side 392, a second wide side 393, and a second long side 394. A central support plate 395 is provided in the middle of the square structure.

[0031] The first long side 392 and the second long side 394 are connected by the second frame component 32. Two adjacent second frame components 32 are connected to the second protruding connector 321 of the other component through the second non-protruding connector 322 of one component.

[0032] The first wide side 391 includes a first border component 31 and a second border component 32, and two adjacent protruding connectors are provided in the first wide side; the second wide side 393 includes a third border component 33 and a second border component 32, and two adjacent non-protruding connectors are provided in the second wide side 393.

[0033] The intermediate support plate 395 is formed by connecting intermediate components 34. The intermediate component 34 has a T-shaped structure, with an intermediate component connecting platform 342 at one end and an intermediate component connecting plate 341 at the other end. Two adjacent intermediate components 34 are connected to the intermediate component connecting plate 341 of the other component through the intermediate component connecting platform 342 of one component. One end of the intermediate support plate 395 is the connecting plate end, and the other end is the connecting platform end.

[0034] The connecting plate end of the intermediate support plate 395 is connected to the structure adjacent to the two protruding connecting heads in the first wide side 391, and the connecting platform end of the intermediate support plate 395 is connected to the structure adjacent to the two non-protruding connecting heads in the second wide side 393; there are connecting holes 35 on the frame body 39.

[0035] The cover plate 30 is a rectangular structure with a patterned steel plate 301 on top. Studs 302 are installed on the bottom surface of the patterned steel plate 301. The cover plate 30 covers the frame body 39. The studs 302 pass through the holes on the frame body 39 and are fixed with nuts 303. Flat steel 304 is installed on the bottom surface of the patterned steel plate 301 and supports the frame body 39.

[0036] The support component 4 includes a first support component 41 and a second support component 42. The main body of the support component 4 adopts an L-shaped structure. The first support component 41 is Z-shaped and has connection holes 35 at both ends. The second support component 42 is I-shaped and has a first plane 420 at one end, with connection holes 35 on the first plane 420.

[0037] The base 5 has an L-shaped structure, with a second plane 40 at one end that is perpendicular to the main structure and has a size larger than the main structure. The base 5 has a connection hole 35.

[0038] The L-shaped structure is made of angle steel, and the protruding connector is manufactured by stamping or welding. The number of connecting holes 35 on the main body is adjusted according to actual needs. Holes are made on the surface of the cover plate 30, and a seamless steel pipe 306 is welded to the bottom surface of the cover plate 30.

[0039] The platform also includes a railing assembly 36, which comprises vertical bars 361 and horizontal bars 362. The vertical bars 361 are made of seamless steel pipes 306, with auxiliary bars 3612 welded onto the main bars 3611. The horizontal bars 362 consist of a main body 3621 and round steel bars 3622 bent downwards at both ends at 90 degrees. The bent round steel bars 3622 are inserted into the auxiliary bars 3612 for connection. The railing assembly 36 has two rows.

[0040] Figure 6 and Figure 7 A method for laying a footboard platform in a narrow entrance compartment of a ship is shown, comprising the following steps: S1. Construct the first long side 392 and the second long side 394, which are connected by the second frame component 32. Two adjacent second frame components 32 are connected to the second protruding connector 321 of the other component through the second non-protruding connector 322 of one component. S2. Construct an intermediate support plate 395, which is formed by connecting intermediate components 34; two adjacent intermediate components 34 are connected to the intermediate component connecting plate 341 of the other component through the intermediate component connecting platform 342 of one component; one end of the intermediate support plate 395 is the connecting plate end, and the other end is the connecting platform end. S3, the connecting end of one intermediate support plate 395 is connected to the third non-protruding connector 331 of two third frame components 33; the connecting end of another intermediate support plate 395 is connected to the second non-protruding connector 322 and the third non-protruding connector 331; the end of the frame component not connected to the intermediate support plate 395 is connected to the first long side 392 or the second long side 394. S4. The connecting plate end of one intermediate support plate 395 is connected to the first protruding connecting head 311 of two first frame components 31; the connecting plate end of the other intermediate support plate 395 is connected to the first protruding connecting head 311 and the second protruding connecting head 321; the end of the frame component not connected to the intermediate support plate 395 is connected to the first long side 392 or the second long side 394. S5. Pass the studs 302 of the cover plate 30 through the holes on the frame, install each cover plate 30 in sequence, and pre-fix it with nuts 303; S6. After the main body of the pedal platform 3 is assembled, adjust the positional relationship of each component and re-fix each bolt and nut 303 to complete the final fixation.

[0041] In some specific embodiments, the pedal platform is fixed to the deck 1, connected to the pedal platform body 3 using a second support member 42, and connected to the deck 1 using a base member 5. The height of the pedal platform is adjusted by the number of second support members 42.

[0042] In some specific embodiments, the pedal platform is fixed to the bulkhead 2, connected to the pedal platform body 3 using a first support component 41, and connected to the bulkhead 2 using a base component 5.

[0043] The method for laying the tread platform for a narrow entrance compartment of a ship with railings includes step S7 in addition to the above installation steps. S7. Install railings around the platform. Insert vertical bars 361 into the mounting holes of each railing, and then install each horizontal bar 362 to complete the installation of the railings.

[0044] The frame body 39 has holes for bolting various components and can be connected to other components. The support component 4 includes a first support component 41 that can be angled and a second support component 42 that cannot be angled. The main body of the support component 4 has an L-shaped structure. The first support component 41 is Z-shaped, with connecting holes 35 at both ends for bolting to other components. The second support component 42 is I-shaped, with a flat surface and a hole 305 at one end for support connection. Appropriate hole positions are selected as needed during assembly. The base 5 has an L-shaped structure, with a plane at one end perpendicular to the main structure and larger than the main structure. The L-shaped structure is made of angle steel with a protruding connector, and is manufactured by stamping or welding.

[0045] As described above, a railing assembly 36 can be installed around the platform. Holes 305 are made on the surface of the cover plate 30, and seamless steel pipes 306 are welded to the bottom surface of the cover plate 30 as railing mounting holes for installing the railing assembly 36. The railing assembly 36 includes vertical bars 361 and horizontal bars 362. The vertical bars 361 are composed of seamless steel pipes 306, with auxiliary bars 3612 welded to the main bars 3611. The horizontal bars 362 consist of a main seamless steel pipe 306 and round steel bars 3622 bent downwards at both ends at 90 degrees. The round steel bars 3622 are inserted into the auxiliary bars 3612 for connection. The railing assembly 36 is arranged in two rows to ensure that the railing height meets the requirements and to ensure stability.

[0046] In some specific implementations, when laying out work in a compartment with a narrow entrance, the individual parts are first transported into the compartment through the small entrance, and then assembled according to the steps.

[0047] Depending on the actual assembly needs, each component can be configured in multiple sizes for on-site matching and installation, adapting to various complex environments.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0050] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0051] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A step platform for a narrow entrance compartment on a ship, characterized in that: The pedal platform includes a pedal platform body, supporting components, and a base; the pedal platform body includes a frame body and a cover plate. The main body of the frame comprises a first frame component, a second frame component, and a third frame component. The main body of the frame component is an L-shaped structure. The first frame component has a first protruding connector at both ends. The second frame component has a second protruding connector at one end and a second non-protruding connector at the other end. The third frame component has a third non-protruding connector at both ends. The main body of the frame is a square structure formed by a first wide side, a first long side, a second wide side, and a second long side. A middle support plate is set in the middle of the square structure. The first long side and the second long side are connected by second frame components. Two adjacent second frame components are connected to each other by the second non-protruding connector of one component and the second protruding connector of the other component. The first wide side includes a first border component and a second border component, and two adjacent protruding connectors are provided in the first wide side; the second wide side includes a third border component and a second border component, and two adjacent non-protruding connectors are provided in the second wide side. The intermediate support plate is composed of intermediate components connected together. The intermediate components have a T-shaped structure, with an intermediate component connecting platform at one end and an intermediate component connecting plate at the other end. Two adjacent intermediate components are connected to the intermediate component connecting plate of the other component through the intermediate component connecting platform of one component. One end of the intermediate support plate is the connecting plate end, and the other end is the connecting platform end. The connecting plate end of the middle support plate is connected to the structure adjacent to the two protruding connecting heads in the first wide side, and the connecting platform end of the middle support plate is connected to the structure adjacent to the two non-protruding connecting heads in the second wide side; there are connecting holes on the frame body; The cover plate is a rectangular structure with a patterned steel plate on top and studs on the bottom surface of the patterned steel plate. The cover plate component covers the frame body, and the studs pass through holes in the frame body and are fixed with nuts. Flat steel is provided on the bottom surface of the patterned steel plate and supports the frame body. The support component includes a first support component and a second support component. The main body of the support component adopts an L-shaped structure. The first support component is Z-shaped and has connection holes at both ends. The second support component is I-shaped and has a first plane at one end with connection holes on the first plane. The base body adopts an L-shaped structure, with a second plane at one end that is perpendicular to the main structure and has a larger dimension than the main structure. The base body is provided with connection holes.

2. The step platform for a narrow entrance compartment on a ship according to claim 1, characterized in that: The L-shaped structure is made of angle steel, and the protruding connector is manufactured by stamping or welding.

3. The step platform for a narrow entrance compartment on a ship according to claim 1, characterized in that, The number of connection holes on the main body can be adjusted according to actual needs.

4. The step platform for a narrow entrance compartment on a ship according to claim 1, characterized in that, Holes are made on the surface of the cover plate, and seamless steel pipes are welded to the bottom surface of the cover plate.

5. The step platform for a narrow entrance compartment on a ship according to claim 3, characterized in that, The platform also includes a railing assembly, which includes vertical bars and horizontal bars. The vertical bars are made of seamless steel pipes, with auxiliary bars welded to the main bars. The horizontal bars are made of a main body and round steel bars bent downwards at 90 degrees at both ends, with the bent round steel bars inserted into the auxiliary bars for connection.

6. The step platform for a narrow entrance compartment on a ship according to claim 5, characterized in that, The railing components are set in two rows.

Citation Information

Patent Citations

  • A method for erecting scaffolding during the closing stage of the cargo hold bottom side tanks of a bulk carrier.

    CN105539769B

  • Assembled water operation platform

    CN120364076A