Adjustable crawling ladder suitable for construction of large-size bearing platform

Abstract

The utility model discloses an adjustable crawling ladder suitable for construction of a large-size bearing platform, which comprises at least two crawling ladder modules, the at least two crawling ladder modules are sequentially connected along the length direction, and the two adjacent crawling ladder modules are detachably connected. According to the ladder stand, the length of the ladder stand can be flexibly adjusted according to the actual construction condition of the bearing platform, then construction of constructors is facilitated, the ladder stand can be suitable for various working conditions and can be repeatedly used, and resource waste is further avoided.

Description

Technical Field

[0001] The present application generally relates to the field of safe passage technology equipment in bridge engineering, and specifically to an adjustable ladder suitable for large-volume pedestal construction. Background Art

[0002] In order to ensure the construction safety and quality of large-volume pedestals in engineering construction, steel sheet piles or steel hanging boxes are generally used for support, and concrete is poured in layers. In order to facilitate the construction personnel to enter the construction site, it is necessary to install up and down ladders as safe passages. After the large-volume pedestals are poured with the cushion layer, the first layer of concrete, ..., and the last layer of concrete, there is an elevation increase. At this time, it is necessary to replace ladders of different lengths to meet the needs of personnel going up and down. However, the existing ladders are of fixed lengths. As the elevation of the pedestal increases, the original ladder of the assembly cannot be used and needs to be replaced with a new ladder. On the one hand, it reduces the construction efficiency, and on the other hand, it increases the construction cost, resulting in a waste of resources. Utility Model Content

[0003] In view of the above-mentioned defects or shortcomings in the prior art, it is desired to provide an adjustable ladder suitable for the construction of large-volume pedestals, which can adjust the length of the ladder according to the actual construction height of the pedestal, thereby facilitating construction, improving construction efficiency and avoiding waste of resources.

[0004] The utility model provides an adjustable ladder suitable for large-volume foundation construction, comprising at least two ladder sub-modules, wherein the at least two ladder sub-modules are connected in sequence along the length direction, and two adjacent ladder sub-modules are detachably connected.

[0005] As an optional solution, each ladder module comprises two supporting main beams and at least two pedals;

[0006] The two supporting main beams are spaced apart and parallel, and are inclined at a predetermined angle. At least two pedals are spaced apart and parallel along the length direction of the supporting beams between the two supporting main beams, and each pedal is located at a different height. Both ends of each pedal are fixedly connected to the supporting main beams.

[0007] As an optional solution, each ladder module further includes a bearing platform, which is installed at least one end portion of the supporting main beam in the length direction, and the bearing platform is parallel to the pedal.

[0008] As an optional solution, each ladder sub-module also includes a first guardrail assembly and a second guardrail assembly. The first guardrail assembly is installed on the supporting main beam and is located on both sides of the pedal. The second guardrail assembly is arranged on both sides of the load-bearing platform, and the first guardrail assembly and the second guardrail assembly are fixedly connected. A protective space is defined between the first guardrail assembly, the second guardrail assembly, the pedal and the load-bearing platform.

[0009] As an optional solution, the first guardrail assembly includes at least two first guardrail cross bars and at least two first guardrail vertical bars, at least two first guardrail cross bars extend along the inclined direction of the supporting main beam and are spaced apart along the vertical direction, and at least two first guardrail vertical bars extend along the vertical direction and are spaced apart and parallel along the inclined direction of the supporting main beam.

[0010] As an optional solution, the second guardrail assembly includes at least two second guardrail cross bars and at least two second guardrail vertical bars, at least two second guardrail cross bars extend along the width direction of the load-bearing platform and are spaced apart in the vertical direction, and at least two second guardrail vertical bars extend along the vertical direction and are spaced apart and arranged in parallel along the width direction of the load-bearing platform.

[0011] As an optional solution, the first guardrail assembly further includes a first skirting guard plate, which is extended along the inclined direction of the supporting main beam, and the first skirting guard plate is fixedly connected to the supporting main beam and the first guardrail upright pole respectively;

[0012] The second guardrail assembly also includes a second skirting plate, which is extended along the width direction of the load-bearing platform and is fixedly connected to the supporting main beam and the second guardrail upright pole respectively.

[0013] As an optional solution, the ladder further includes a connecting component, which is arranged between two adjacent ladder sub-modules, and the connecting component is detachably connected to the two adjacent ladder sub-modules.

[0014] As an optional solution, the connecting assembly includes a connecting plate and a fastener, wherein the connecting plate is arranged at the end of the supporting main beam of each ladder sub-module, the connecting plate is extended along a predetermined direction, and the fastener passes through the connecting plates on two adjacent ladder sub-modules and is threadedly connected to the connecting plate; wherein the predetermined direction refers to a direction extending vertically from the supporting main beam toward a direction away from the supporting main beam.

[0015] As an optional solution, the dimensions of each ladder sub-module in the length direction are different.

[0016] The utility model is an adjustable ladder suitable for large-volume foundation construction, comprising at least two ladder modules, at least two ladder modules are connected in sequence along the length direction, and two adjacent ladder modules are detachably connected. The utility model ladder can flexibly adjust the length of the ladder according to the actual foundation construction situation, thereby facilitating the construction of construction personnel, and the ladder can be applied to a variety of working conditions and reused, further avoiding waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 A schematic diagram of the structure of an adjustable ladder suitable for large-volume pedestal construction provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the structure of an adjustable ladder suitable for large-volume pedestal construction provided in an embodiment of the present application;

[0020] Figure 3 for Figure 2 A partial enlarged view of middle A;

[0021] Figure 4 This is a construction drawing of an adjustable ladder suitable for large-volume pedestal construction according to an embodiment of the present application;

[0022] Figure 5 This is a construction drawing of another adjustable ladder suitable for large-volume pedestal construction according to an embodiment of the present application;

[0023] Figure 6 This is a construction drawing of another adjustable ladder suitable for large-volume pedestal construction according to an embodiment of the present application.

[0024] In the figure,

[0025] 100. Adjustable ladder

[0026] 10, first ladder module, 20, second ladder module, 30, third ladder module;

[0027] 1. Supporting main beam, 2. Load-bearing platform, 3. Pedal, 4. Fastener, 5. Connecting plate, 6. First guardrail crossbar, 7. First guardrail upright, 8. Second guardrail crossbar, 9. Second guardrail upright, 91. First skirting guard plate, 92. Second skirting guard plate;

[0028] A1, pier platform, A2, pedestal, A3, bottom concrete layer, A4, first concrete layer, A5, second concrete layer. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant application, rather than to limit the application. It is also necessary to explain that, for ease of description, only the parts related to the application are shown in the accompanying drawings.

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0032] The construction method of large-volume pedestals is generally to pour in layers, pouring the cushion layer, the first layer of concrete, the second layer of concrete, ..., the last layer of concrete in sequence. In this process, after each layer is completed, the elevation of the pedestal will increase. The existing ladder is generally of fixed length. As the elevation of the pedestal increases, there will be excess length of the ladder, resulting in one end of the ladder being on the surface of the pedestal and the other end hanging in the air. Construction workers cannot use it and need to replace it with a new ladder, which reduces construction efficiency and causes waste of resources.

[0033] Based on the above problems, the embodiment of the present application provides an adjustable ladder 100 suitable for large-volume pedestal construction, such as Figure 1-3 As shown, it includes at least two ladder modules, at least two ladder modules are connected in sequence along the length direction, and two adjacent ladder modules are detachably connected.

[0034] It should be noted that the ladder of the present application is mainly used to facilitate construction workers to move between a relatively high position and a relatively low position (ie, between the trestle platform and the pier).

[0035] It can be understood that the ladder can include two or more ladder modules, each ladder module can be used as an independent ladder, the length of each ladder module can be the same, of course, can also be different, the embodiments of the present application do not make specific limitations on this, as long as the operator can move between a relatively high position and a relatively low position.

[0036] It can also be understood that at least two ladder modules are connected in sequence along the length direction, which can reliably change the length of the ladder, and the two adjacent ladder modules are detachably connected, which is conducive to flexibly adjusting the length of the ladder according to actual construction conditions, thereby facilitating construction, improving construction efficiency and reducing resource waste.

[0037] Among them, two adjacent ladder modules can be connected by any detachable connection method, for example, two adjacent ladder modules are connected by bolts. Of course, two adjacent ladder modules can also be connected by buckles.

[0038] For example, in the actual construction process of the foundation, when the cushion layer construction is first carried out, multiple ladder modules need to be connected as a whole. At this time, the length of the ladder can connect the foundation cushion layer to the trestle platform; as the construction progresses, after the first concrete layer is poured, one of the ladder modules is removed, and the remaining ladder modules are reconnected as a whole to shorten the length of the ladder. At this time, the length of the ladder can connect the first concrete layer and the trestle platform, making it convenient for construction workers to construct the second concrete layer.

[0039] The adjustable ladder applicable to the construction of a large-volume pedestal in the embodiment of the present application solves the problem that the length of the ladder in the prior art cannot be adjusted, resulting in inconvenience in construction and waste of resources. The adjustable ladder applicable to the construction of a large-volume pedestal in the embodiment of the present application is connected in sequence along the length direction through at least two ladder sub-modules, and the two adjacent ladder sub-modules are detachably connected, so that the length of the ladder can be flexibly adjusted according to the actual pedestal construction situation, thereby facilitating the construction of construction personnel, and the ladder can be applied to a variety of working conditions and reused, further avoiding waste of resources.

[0040] As an achievable manner, each ladder module comprises two supporting main beams 1 and at least two steps 3;

[0041] The two supporting main beams 1 are spaced apart and parallel, and are inclined at a predetermined angle. At least two pedals 3 are spaced apart and parallel along the length direction of the supporting beams between the two supporting main beams 1, and each pedal 3 is located at a different height. Both ends of each pedal 3 are fixedly connected to the supporting main beams 1 respectively.

[0042] It is understandable that the predetermined angle is predetermined according to actual construction needs. When the length of each supporting main beam 1 is determined, changing the predetermined angle can change the height of the ladder in the numerical direction; in some embodiments, the predetermined angle of the supporting main beam 1 of each ladder module can be the same, and in other embodiments, the predetermined angle of the supporting main beam 1 of each ladder module can also be different, so as to facilitate the flexible adjustment of the height of the ladder. Among them, the supporting main beam 1 can be made of channel steel for welding the pedal 3; the pedal 3 can be made of angle steel, and the two ends of the pedal 3 are welded between the supporting main beams 1 on both sides for the movement of construction personnel.

[0043] It can also be understood that the length of the supporting main beam 1 in each ladder module can be the same or different, and correspondingly, the number of pedals 3 changes with the length of the supporting main beam 1. The longer the length of the supporting main beam 1, the more pedals 3 there are, and the shorter the length of the supporting main beam 1, the fewer pedals 3 there are.

[0044] The supporting main beam 1 in this embodiment serves as the main body of the ladder module and is used to carry other components such as the pedal 3, so that the ladder module can be reliably used for the movement of construction workers.

[0045] As an achievable manner, each ladder module further includes a bearing platform 2 , which is installed at least one end portion of the supporting main beam 1 in the length direction, and the bearing platform 2 is parallel to the pedal 3 .

[0046] The bearing platform 2 in this embodiment is located at the end of the supporting main beam 1, just at the connection between two adjacent ladder modules, playing a transition role and making it convenient for construction workers to stand.

[0047] In actual processing, the bearing platform 2 is welded on the supporting main beams 1 on both sides. The width of the bearing platform 2 can be 60 cm, and the length of the bearing platform 2 is the same as the length of the pedal 3.

[0048] As a feasible method, each ladder sub-module also includes a first guardrail assembly and a second guardrail assembly. The first guardrail assembly is installed on the supporting main beam 1 and is located on both sides of the pedal 3. The second guardrail assembly is arranged on both sides of the supporting platform 2, and the first guardrail assembly and the second guardrail assembly are fixedly connected. A protective space is defined between the first guardrail assembly, the second guardrail assembly, the pedal 3 and the supporting platform 2.

[0049] The first guardrail assembly and the second guardrail assembly in this embodiment are beneficial to protecting construction workers and are used by construction workers to hold on to, thereby ensuring the safe movement of construction workers.

[0050] In some embodiments, the first guardrail assembly includes at least two first guardrail cross bars 6 and at least two first guardrail vertical bars 7, at least two first guardrail cross bars 6 extend along the inclined direction of the supporting main beam 1 and are spaced apart along the vertical direction, and at least two first guardrail vertical bars 7 extend along the vertical direction and are spaced apart and parallel along the inclined direction of the supporting main beam 1.

[0051] Among them, the first guardrail cross bar 6 is made of steel pipe, and the first guardrail cross bar 6 is welded to the first guardrail upright 7. The spacing between the first guardrail cross bars 6 can be determined according to actual needs, for example, it can be 60cm; the first guardrail upright 7 is made of steel pipe, and the first guardrail upright 7 is welded to the supporting main beam 1. The length of the first guardrail upright 7 is determined according to actual needs, for example, it can be 1.2m.

[0052] In some embodiments, the second guardrail assembly includes at least two second guardrail cross bars 8 and at least two second guardrail uprights 9, at least two second guardrail cross bars 8 extend along the width direction of the supporting platform 2 and are spaced apart in the vertical direction, and at least two second guardrail uprights 9 extend along the vertical direction and are spaced apart in parallel along the width direction of the supporting platform 2.

[0053] Among them, the second guardrail cross bar 8 is made of steel pipe, and the second guardrail cross bar 8 is welded to the second guardrail upright 9. The spacing between the second guardrail cross bars 8 can be determined according to actual needs, for example, it can be 60cm; the second guardrail upright 9 is made of steel pipe, and the second guardrail upright 9 is welded to the supporting main beam 1. The length of the second guardrail upright 9 is determined according to actual needs, for example, it can be 1.2m.

[0054] As an achievable manner, the first guardrail assembly further includes a first skirting guard plate 91, the first skirting guard plate 91 is extended along the inclined direction of the supporting main beam 1, and the first skirting guard plate 91 is respectively fixedly connected to the supporting main beam 1 and the first guardrail upright 7;

[0055] The second guardrail assembly also includes a second skirting plate 92. The second skirting plate 91 is extended along the width direction of the bearing platform 2, and the second skirting plate is fixedly connected to the supporting main beam 1 and the second guardrail upright 9 respectively.

[0056] Among them, the first skirting guard plate 91 and the second skirting guard plate 92 are made of steel plates. The first skirting guard plate 91 can be welded under the first guardrail upright 7, and the second skirting guard plate 92 can be welded under the second guardrail upright 9, which can be used to provide further protection.

[0057] The first skirting guard plate and the second skirting guard plate in this embodiment are mainly used to protect the feet of construction workers, prevent the construction workers from stepping on empty space, and further ensure the safe passage of the construction workers.

[0058] As an achievable manner, the ladder further comprises a connecting component, which is disposed between two adjacent ladder sub-modules, and the connecting component is detachably connected to the two adjacent ladder sub-modules.

[0059] The connection component in this embodiment is mainly used to connect at least two ladder modules. The connection component is arranged between two adjacent ladder modules to realize the connection between the two adjacent ladder modules and improve the reliability and strength of the connection between the two adjacent ladder modules.

[0060] The connecting components may be, but are not limited to, buckles, bolts, etc.

[0061] In some embodiments, the connecting assembly includes a connecting plate 5 and a fastener 4, the connecting plate 5 is arranged at the end of the supporting main beam 1 of each ladder sub-module, the connecting plate 5 is extended along a predetermined direction, and the fastener 4 passes through the connecting plates 5 on two adjacent ladder sub-modules and is threadedly connected to the connecting plate 5; wherein the predetermined direction refers to a direction extending vertically from the supporting main beam 1 toward a direction away from the supporting main beam 1.

[0062] The fasteners 4 may be bolts and nuts, threaded holes are provided on the connecting plates 5, and the bolts pass through the threaded holes on the two connecting plates 5, and the connection between the two adjacent ladder modules is achieved through threaded cooperation.

[0063] In actual processing, the connecting plate 5 is made of steel plate, and the connecting plate 5 is welded to the supporting main beam 1 .

[0064] In this embodiment, the connecting plate 5 and the fastener 4 have a simple structure, are easy to process, and are convenient to assemble and disassemble, which is conducive to improving construction efficiency.

[0065] As an achievable manner, the dimensions of each ladder sub-module in the length direction are different.

[0066] The ladder submodule in this embodiment is conducive to flexible adjustment of the overall length of the ladder, so that the ladder can be applied to a variety of working conditions, ensuring reliable construction for construction workers while reducing waste of resources.

[0067] In summary, the adjustable ladder suitable for large-volume pedestal construction in the embodiment of the present application is connected in sequence along the length direction by at least two ladder sub-modules, and the two adjacent ladder sub-modules are detachably connected, so that the length of the ladder can be flexibly adjusted according to the actual pedestal construction situation, thereby facilitating the construction of construction personnel, and the ladder can be applied to a variety of working conditions and reused, further avoiding waste of resources;

[0068] In addition, by providing the bearing platform 2, a transition function is provided, which facilitates the construction workers to stand; by providing the first guardrail assembly and the second guardrail assembly, the safe passage of the construction workers is further guaranteed.

[0069] The steel bar positioning frame of the present utility model is described below through a specific embodiment.

[0070] like Figure 1-3 As shown, the ladder includes three ladder sub-modules, which are respectively denoted as a first ladder sub-module 10, a second ladder sub-module 20 and a third ladder sub-module 30;

[0071] Each ladder module includes two parallel supporting beams 1, the two supporting beams 1 are tilted at a predetermined angle, a plurality of parallel pedals 3 are welded between the two supporting beams 1, the plurality of pedals 3 are spaced apart along the length direction of the supporting beams 1, and each pedal 3 is at a different height position;

[0072] A bearing platform 2 is also welded to one end of the supporting main beam 1, and the bearing platform 2 is parallel to the pedal 3;

[0073] A first guardrail assembly is also provided on both sides of the supporting main beam 1, and a second guardrail assembly is provided on both sides of the bearing platform 2. The first guardrail assembly includes a plurality of first guardrail uprights 7 welded on the supporting main beam 1 and a first guardrail crossbar 6 welded on the first guardrail uprights 7. The first guardrail uprights 7 are arranged in parallel at intervals along the length direction of the supporting main beam 1, and the first guardrail uprights 7 extend in the vertical direction. The first guardrail crossbar 6 extends in the length direction of the supporting main beam 1, and is arranged in parallel at intervals along the vertical direction on the first guardrail uprights 7;

[0074] The second guardrail assembly includes a plurality of second guardrail uprights 9 welded on the load-bearing platform 2 and second guardrail crossbars 8 welded on the second guardrail uprights 9, the second guardrail uprights 9 are arranged in parallel and spaced apart along the width direction of the load-bearing platform 2, and the second guardrail uprights 9 extend in the vertical direction, the second guardrail crossbars 8 extend in the width direction of the load-bearing platform 2, and are arranged in parallel and spaced apart along the vertical direction on the second guardrail uprights 9;

[0075] A first skirting plate is welded to the lower part of the first guardrail upright 7 , and the first skirting plate is welded to the supporting main beam 1 . A second skirting plate is welded to the lower part of the second guardrail upright 9 , and the second skirting plate is welded to the bearing platform 2 .

[0076] A connecting plate 5 is welded to the side of the end of the supporting main beam 1. The connecting plate 5 is provided with at least two threaded holes. The connecting plates 5 on two adjacent ladder modules are fastened together by bolts and nuts to form the whole ladder.

[0077] The construction method of this embodiment is as follows:

[0078] (1) After the bottom concrete layer A3 of the cap 1 is poured, Figure 4 As shown, the three ladder sub-modules of the ladder are connected as a whole, and the ladder height can now connect the bottom concrete layer A3 to the trestle platform A1;

[0079] (2) After pouring the first concrete layer A4, remove all bolts. Figure 5 As shown, the third ladder module 30 is bolted to the first ladder module 10 as the second stage of construction up and down the ladder;

[0080] (3) After the second concrete layer A5 is poured, the third ladder module 30 is removed. Figure 6 As shown, the second ladder module 20 is bolted to the first ladder module 10 as the third stage of construction for climbing up and down the ladder.

[0081] Compared with conventional up-and-down ladder construction, the ladder of the embodiment of the present application has the following beneficial effects:

[0082] The ladder structure of the embodiment of the present application can freely adjust the height up and down according to different stages, which is convenient to use and saves materials;

[0083] The ladder structure of the embodiment of the present application can be freely customized according to the layer thickness, and different caps and different foundation pit structures can adopt the structure, which has strong operability;

[0084] The ladder structure of the embodiment of the present application is mainly made of steel, which is not easily affected by the environment during storage and can be recycled.

[0085] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0086] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0087] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0088] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. An adjustable ladder suitable for large-volume foundation construction, characterized by: It comprises at least two ladder modules, wherein the at least two ladder modules are connected in sequence along the length direction, and two adjacent ladder modules are detachably connected; Each ladder module comprises two supporting main beams and at least two steps; The two supporting main beams are spaced apart and parallel and are arranged at an angle inclined along a predetermined angle, the at least two pedals are spaced apart and parallel along the length direction of the supporting main beams and arranged between the two supporting main beams, and each of the pedals is located at a different height, and both ends of each of the pedals are respectively fixedly connected to the supporting main beams; The ladder further comprises a connecting assembly, which is arranged between two adjacent ladder sub-modules and is detachably connected to the two adjacent ladder sub-modules; The connecting assembly includes a connecting plate and a fastener, wherein the connecting plate is arranged at the end of the supporting main beam of each of the ladder sub-modules, the connecting plate is extended along a predetermined direction, and the fastener passes through the connecting plates on two adjacent ladder sub-modules and is threadedly connected to the connecting plate; wherein the predetermined direction refers to a direction extending vertically from the supporting main beam toward away from the supporting main beam.

2. The ladder according to claim 1, characterized in that: Each of the ladder modules further includes a bearing platform, which is installed at at least one end of the supporting main beam in the length direction, and the bearing platform is parallel to the pedal.

3. The ladder according to claim 2, characterized in that: Each of the ladder climbing modules also includes a first guardrail assembly and a second guardrail assembly. The first guardrail assembly is installed on the supporting main beam and is located on both sides of the pedal. The second guardrail assembly is arranged on both sides of the load-bearing platform, and the first guardrail assembly and the second guardrail assembly are fixedly connected. A protective space is defined between the first guardrail assembly, the second guardrail assembly, the pedal and the load-bearing platform.

4. The ladder according to claim 3, characterized in that: The first guardrail assembly includes at least two first guardrail cross bars and at least two first guardrail upright bars, wherein the at least two first guardrail cross bars extend along the inclined direction of the supporting main beam and are spaced apart along the vertical direction, and the at least two first guardrail upright bars extend along the vertical direction and are spaced apart and parallel along the inclined direction of the supporting main beam.

5. The ladder according to claim 4, characterized in that: The second guardrail assembly includes at least two second guardrail cross bars and at least two second guardrail upright bars, wherein the at least two second guardrail cross bars extend along the width direction of the load-bearing platform and are spaced apart in the vertical direction, and the at least two second guardrail upright bars extend along the vertical direction and are spaced apart and parallel along the width direction of the load-bearing platform.

6. The ladder according to claim 5, characterized in that: The first guardrail assembly further includes a first skirting plate, which is extended along the inclined direction of the supporting main beam, and the first skirting plate is fixedly connected to the supporting main beam and the first guardrail upright pole respectively; The second guardrail assembly also includes a second skirting plate, which is extended along the width direction of the bearing platform and is fixedly connected to the supporting main beam and the second guardrail upright pole respectively.

7. The ladder according to any one of claims 1 to 6, characterized in that: Each of the ladder modules has different dimensions in the length direction.

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