Length-adjustable upper and lower safety channel for foundation pit

Abstract

When the length-adjustable up-and-down safety channel for the foundation pit is used, the top section is erected and fixed on the ground on the outer side of the top of the foundation pit, and people can stand and pass through the top platform; the middle ladder stand of the middle section abuts against the side wall of the foundation pit, and the number of the middle sections can be increased or decreased according to needs; the bottom section is erected and fixed on the ground at the bottom of the foundation pit, people can stand and pass through the bottom platform, the bottom section is not provided with a protective cage, people can conveniently enter and exit from the bottom platform, and the bottom section can also be suspended, for example, the bottom section enters the middle section through the top platform and moves downwards through the middle crawling ladder when being used for bearing platform structure construction and when people need to go up and down the foundation pit, such as going down the foundation pit. And then a bottom ladder stand descends to a bottom platform, and during the period, protection is conducted through a top front side guardrail, a top rear side guardrail, a top protection cage, a middle protection cage, a bottom front side guardrail and a bottom rear side guardrail. The device is adjustable in length, convenient and safe to use and capable of improving construction efficiency and construction safety.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit engineering technology, and in particular to the field of foundation pit safety passage technology, specifically referring to a foundation pit safety passage with adjustable length. Background Technology

[0002] Foundation pit engineering refers to the measures required to ensure the safety and stability of underground spaces created by downward excavation during the construction of underground structures, including retaining structures, groundwater control, and environmental protection. Foundation pit engineering is a systematic project integrating geological engineering, geotechnical engineering, structural engineering, and geotechnical testing technology.

[0003] An excavation pit is a space excavated downwards from the ground for the construction of the underground portion of a building or structure. Once the excavation pit reaches the designed bottom elevation, construction workers need to access the bottom to inspect the pit or begin construction work. Similarly, once the structure within the pit reaches the designed structural elevation, workers need to access the structural work surface to carry out engineering activities. Both situations require safe access passages between the excavation pit and the site. Since the excavation pit is a temporary space for underground structural construction and is often not excavated extensively, space is limited. Therefore, ladders with protective cages are frequently used as safe passages. However, the fixed length of these ladders makes it difficult to adapt to changes in project progress that require different lengths. Furthermore, the protective cage itself, as part of the safety protection system, makes it difficult for workers to enter and exit from the bottom of the passage, leading to instances of arbitrarily cutting the cage on the construction site. Additionally, the lack of footholds at the bottom of the ladder often results in a few pieces of wood being randomly placed on the construction site, all of which cause inconvenience and significant safety hazards during construction.

[0004] Therefore, it is desirable to provide a safety passage for the upper and lower parts of the foundation pit with adjustable length, which is convenient and safe to use, and improves construction efficiency and safety. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, one objective of this utility model is to provide a safety passage for the upper and lower parts of the foundation pit with adjustable length. Its length is adjustable, it is convenient and safe to use, improves construction efficiency and construction safety, and is suitable for large-scale promotion and application.

[0006] Another objective of this utility model is to provide a safety passage for the upper and lower parts of a foundation pit with adjustable length. It is ingeniously designed, simple in structure, easy to manufacture, and has low manufacturing cost, making it suitable for large-scale promotion and application.

[0007] To achieve the above objectives, this utility model provides a safety passage for ascending and descending in an adjustable-length foundation pit, characterized by comprising a top section, a middle section, and a bottom section, wherein:

[0008] The top section includes a top platform, a front top guardrail, a rear top guardrail, and a top cage. The top platform is horizontally arranged along the left-right direction. The front top guardrail and the rear top guardrail are both vertically arranged along the left-right direction and are spaced apart from each other. The front top guardrail and the rear top guardrail are respectively located on the front and rear sides of the top platform. The top cage is vertically arranged, and a first opening is vertically arranged on the left side of the top cage. The first opening is located on the right side of the top platform, the front top guardrail, and the rear top guardrail and is respectively connected to the front top guardrail and the rear top guardrail.

[0009] The bottom section includes a bottom platform, a bottom front guardrail, a bottom rear guardrail, and a bottom ladder. The bottom platform is horizontally arranged along the left-right direction. The bottom front guardrail and the bottom rear guardrail are both vertically arranged along the left-right direction and are spaced apart from each other. The bottom front guardrail and the bottom rear guardrail are respectively located on the front and rear sides of the bottom platform. The bottom ladder is vertically arranged along the front-back direction. The lower part of the bottom ladder is located to the left of the bottom platform, the bottom front guardrail, and the bottom rear guardrail and is respectively connected to the bottom platform, the bottom front guardrail, and the bottom rear guardrail.

[0010] The intermediate section includes an intermediate ladder and an intermediate guard cage. The intermediate ladder is vertically arranged along the front-to-back direction. The intermediate guard cage is vertically arranged, and a second opening is vertically arranged on the left side of the intermediate guard cage. The second opening is located on the right side of the intermediate ladder and connects to the intermediate ladder. The intermediate section is located between the top section and the bottom section. The lower right side of the front top guardrail and the lower right side of the rear top guardrail are detachably connected to the upper end of the intermediate ladder. The top guard cage is located above the intermediate guard cage. The lower end of the intermediate ladder is detachably connected to the upper end of the bottom ladder and is used for detachably connecting to the upper end of the intermediate ladder.

[0011] Preferably, the number of intermediate sections is multiple, and the multiple intermediate sections are arranged vertically in sequence. In two adjacent intermediate sections, the lower end of the intermediate ladder of the upper intermediate section is detachably connected to the upper end of the intermediate ladder of the lower intermediate section. The intermediate guard cage of the upper intermediate section is located above the intermediate guard cage of the lower intermediate section. The lower right side of the top front guardrail and the lower right side of the top rear guardrail are detachably connected to the upper end of the intermediate ladder of the uppermost intermediate section. The top guard cage is located above the intermediate guard cage of the uppermost intermediate section. The lower end of the intermediate ladder of the lowermost intermediate section is detachably connected to the upper end of the bottom ladder.

[0012] More preferably, the number of intermediate sections is 2.

[0013] Preferably, the lower right side of the top front guardrail and the upper end of the middle ladder, the lower right side of the top rear guardrail and the upper end of the middle ladder, and the lower end of the middle ladder and the upper end of the bottom ladder are all detachably connected by bolts and nuts, and the lower end of the middle ladder is used to detachably connect to the upper end of the middle ladder by bolts and nuts.

[0014] Preferably, the intermediate ladder includes a front intermediate upright, a rear intermediate upright, and intermediate longitudinal bars. The front intermediate upright and the rear intermediate upright are spaced apart from each other. The intermediate longitudinal bars are located between the front intermediate upright and the rear intermediate upright and connect to the front intermediate upright and the rear intermediate upright respectively. There are multiple intermediate longitudinal bars, which are spaced apart vertically. The second opening is located on the right side of the front intermediate upright and the rear intermediate upright and connects to the front intermediate upright and the rear intermediate upright respectively. The lower right side of the top front guardrail and the lower right side of the top rear guardrail are detachably connected to the upper end of the front intermediate upright and the upper end of the rear intermediate upright respectively. The lower end of the front intermediate upright and the lower end of the rear intermediate upright are detachably connected to the upper end of the bottom ladder.

[0015] More preferably, the number of intermediate longitudinal bars is nine.

[0016] Preferably, the bottom ladder includes a front bottom upright, a rear bottom upright, and bottom longitudinal bars. The front bottom upright and the rear bottom upright are spaced apart from each other. The bottom longitudinal bars are located between the front bottom upright and the rear bottom upright and connect to the front bottom upright and the rear bottom upright respectively. There are multiple bottom longitudinal bars, which are spaced apart vertically. The lower part of the front bottom upright is located to the left of the bottom platform and the bottom front guardrail and connects to the bottom platform and the bottom front guardrail respectively. The lower part of the rear bottom upright is located to the left of the bottom platform and the bottom rear guardrail and connects to the bottom platform and the bottom rear guardrail respectively. The lower end of the middle ladder is detachably connected to the upper end of the front bottom upright and the upper end of the rear bottom upright respectively.

[0017] More preferably, the number of bottom longitudinal bars is 5.

[0018] Preferably, the top section further includes a top support leg, the top support leg being vertically arranged, the left end of the top platform being disposed on the top support leg, and the number of top support legs being multiple, with the multiple top support legs being spaced apart from each other.

[0019] Preferably, the bottom section further includes bottom support feet, which are vertically arranged. The right end of the bottom platform is disposed on the bottom support feet. There are multiple bottom support feet, which are spaced apart from each other.

[0020] The main beneficial effects of this utility model are as follows:

[0021] 1. This utility model provides an adjustable-length safety passage for ascending and descending foundation pits. In use, the top section is erected and fixed to the ground outside the top of the foundation pit. With the top support legs present, these legs are supported or inserted into the ground, providing a platform for people to stand and pass through. The middle ladder of the intermediate section is placed against the side wall of the foundation pit. The number of intermediate sections can be increased or decreased as needed. The bottom section is erected and fixed to the ground at the bottom of the foundation pit. With the bottom support legs present, these legs are supported or inserted into the ground, providing a platform for people to stand and pass through. The bottom section has no guardrail, facilitating entry and exit. The bottom section can also be suspended, for example, during the construction of a foundation cap structure. When ascending or descending the foundation pit, one enters through the top platform into the intermediate section, descends via the middle ladder, and then descends to the bottom platform via the bottom ladder. During this process, protection is provided by the top front guardrail, top rear guardrail, top guardrail, middle guardrail, bottom front guardrail, and bottom rear guardrail. Therefore, its length is adjustable, making it convenient and safe to use, improving construction efficiency and safety, and suitable for large-scale application.

[0022] 2. This utility model features an adjustable-length safety passage for ascending and descending foundation pits. In use, the top section is erected and fixed to the ground outside the top of the foundation pit. With the top support legs present, these legs are supported or inserted into the ground, providing a platform for people to stand and pass through. The middle ladder of the intermediate section is placed against the side wall of the foundation pit. The number of intermediate sections can be increased or decreased as needed. The bottom section is erected and fixed to the ground at the bottom of the foundation pit. With the bottom support legs present, these legs are supported or inserted into the ground, providing a platform for people to stand and pass through. The bottom section has no guardrail, facilitating entry and exit. The bottom section can also be suspended, for example, during the construction of a foundation cap structure. When ascending or descending the foundation pit, one enters through the top platform into the intermediate section, descends via the middle ladder, and then descends to the bottom platform via the bottom ladder. During this process, protection is provided by the top front guardrail, top rear guardrail, top guardrail, intermediate guardrail, bottom front guardrail, and bottom rear guardrail. Therefore, its design is ingenious, its structure is simple, its manufacturing is easy, and its manufacturing cost is low, making it suitable for large-scale application.

[0023] These and other objects, features and advantages of this utility model will be fully apparent from the following detailed description and drawings, and can be achieved by the means, devices and combinations thereof specifically pointed out in the description of the utility model. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of a specific embodiment of the adjustable-length safety passage for the foundation pit according to this utility model.

[0025] Figure 2 yes Figure 1 The diagram shows a front view of a specific embodiment.

[0026] Figure 3 yes Figure 1 The rear view diagram of the specific embodiment shown.

[0027] (Symbol Explanation)

[0028] 1. Top section; 11. Top platform; 12. Top front guardrail; 13. Top rear guardrail; 14. Top cage; 15. First opening; 16. Top support feet;

[0029] 2. Intermediate section; 21. Intermediate ladder; 22. Intermediate cage; 23. Second opening; 24. Front intermediate upright; 25. Rear intermediate upright; 26. Intermediate longitudinal bar;

[0030] 3 Bottom section; 31 Bottom platform; 32 Bottom front guardrail; 33 Bottom rear guardrail; 34 Bottom ladder; 35 Front bottom upright; 36 Rear bottom upright; 37 Bottom longitudinal bar; 38 Bottom support foot. Detailed Implementation

[0031] In order to better understand the technical content of this utility model, the following embodiments are provided for detailed description.

[0032] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Please see Figures 1-3 As shown, in a specific embodiment of this utility model, the adjustable-length safety passage for the foundation pit includes a top section 1, a middle section 2, and a bottom section 3, wherein:

[0034] The top section 1 includes a top platform 11, a front top guardrail 12, a rear top guardrail 13, and a top cage 14. The top platform 11 is horizontally arranged along the left-right direction. The front top guardrail 12 and the rear top guardrail 13 are both vertically arranged along the left-right direction and are spaced apart from each other. The front top guardrail 12 and the rear top guardrail 13 are respectively located on the front and rear sides of the top platform 11. The top cage 14 is vertically arranged, and a first opening 15 is vertically arranged on the left side of the top cage 14. The first opening 15 is located on the right side of the top platform 11, the front top guardrail 12, and the rear top guardrail 13 and is respectively connected to the front top guardrail 12 and the rear top guardrail 13.

[0035] The bottom section 3 includes a bottom platform 31, a bottom front guardrail 32, a bottom rear guardrail 33, and a bottom ladder 34. The bottom platform 31 is horizontally arranged along the left-right direction. The bottom front guardrail 32 and the bottom rear guardrail 33 are both vertically arranged along the left-right direction and are spaced apart from each other. The bottom front guardrail 32 and the bottom rear guardrail 33 are respectively located on the front and rear sides of the bottom platform 31. The bottom ladder 34 is vertically arranged along the front-back direction. The lower part of the bottom ladder 34 is located to the left of the bottom platform 31, the bottom front guardrail 32, and the bottom rear guardrail 33 and connects the bottom platform 31, the bottom front guardrail 32, and the bottom rear guardrail 33 respectively.

[0036] The intermediate section 2 includes an intermediate ladder 21 and an intermediate guard cage 22. The intermediate ladder 21 is vertically arranged along the front-to-back direction. The intermediate guard cage 22 is vertically arranged, and a second opening 23 is vertically arranged on the left side of the intermediate guard cage 22. The second opening 23 is located on the right side of the intermediate ladder 21 and connected to the intermediate ladder 21. The intermediate section 2 is located between the top section 1 and the bottom section 3. The lower right side of the top front guardrail 12 and the lower right side of the top rear guardrail 13 can be detachably connected to the upper end of the intermediate ladder 21. The top guard cage 14 is located above the intermediate guard cage 22. The lower end of the intermediate ladder 21 is detachably connected to the upper end of the bottom ladder 34 and is used for detachably connecting the upper end of the intermediate ladder 21.

[0037] The number of intermediate sections 2 can be determined as needed; please refer to [link / reference]. Figures 1-3As shown, in a specific embodiment of this utility model, the number of intermediate sections 2 is one. The number of intermediate sections 2 can also be multiple, with multiple intermediate sections 2 arranged vertically in sequence. In two adjacent intermediate sections 2, the lower end of the intermediate ladder 21 of the upper intermediate section 2 is detachably connected to the upper end of the intermediate ladder 21 of the lower intermediate section 2. The intermediate guard cage 22 of the upper intermediate section 2 is located above the intermediate guard cage 22 of the lower intermediate section 2. The lower right side of the top front guardrail 12 and the lower right side of the top rear guardrail 13 are detachably connected to the upper end of the intermediate ladder 21 of the uppermost intermediate section 2. The top guard cage 14 is located above the intermediate guard cage 22 of the uppermost intermediate section 2. The lower end of the intermediate ladder 21 of the lowermost intermediate section 2 is detachably connected to the upper end of the bottom ladder 34. For example, the number of intermediate sections 2 is two.

[0038] The lower right side of the top front guardrail 12 and the lower right side of the top rear guardrail 13 are detachably connected to the upper end of the middle ladder 21. The lower end of the middle ladder 21 is detachably connected to the upper end of the bottom ladder 34 and is used for detachably connecting the upper end of the middle ladder 21. Any suitable structure can be adopted. In a specific embodiment of this utility model, the lower right side of the top front guardrail 12 and the upper end of the middle ladder 21, the lower right side of the top rear guardrail 13 and the upper end of the middle ladder 21, and the lower end of the middle ladder 21 and the upper end of the bottom ladder 34 are all detachably connected by bolts and nuts. The lower end of the middle ladder 21 is used for detachably connecting the upper end of the middle ladder 21 by bolts and nuts. When there are multiple intermediate sections 2, the lower end of the intermediate ladder 21 of the upper intermediate section 2 and the upper end of the intermediate ladder 21 of the lower intermediate section 2, the lower right side of the top front guardrail 12 and the upper end of the intermediate ladder 21 of the uppermost intermediate section 2, the lower right side of the top rear guardrail 13 and the upper end of the intermediate ladder 21 of the uppermost intermediate section 2, the lower end of the intermediate ladder 21 of the lowermost intermediate section 2 and the upper end of the bottom ladder 34 are all detachably connected by bolts and nuts.

[0039] The intermediate ladder 21 can have any suitable configuration; please refer to [link / reference]. Figures 1-3As shown, in a specific embodiment of this utility model, the intermediate ladder 21 includes a front intermediate upright 24, a rear intermediate upright 25, and an intermediate longitudinal bar 26. The front intermediate upright 24 and the rear intermediate upright 25 are spaced apart from each other. The intermediate longitudinal bar 26 is located between the front intermediate upright 24 and the rear intermediate upright 25 and connects the front intermediate upright 24 and the rear intermediate upright 25 respectively. There are multiple intermediate longitudinal bars 26, which are spaced apart vertically. The second opening 23 is located to the right of the front middle upright 24 and the rear middle upright 25 and is connected to the front middle upright 24 and the rear middle upright 25 respectively. The lower right part of the top front guardrail 12 and the lower right part of the top rear guardrail 13 are detachably connected to the upper end of the front middle upright 24 and the upper end of the rear middle upright 25 respectively. The lower end of the front middle upright 24 and the lower end of the rear middle upright 25 are detachably connected to the upper end of the bottom ladder 34. When there are multiple intermediate sections 2, the lower right side of the top front guardrail 12 and the lower right side of the top rear guardrail 13 are respectively detachably connected to the upper end of the front intermediate upright 24 and the upper end of the rear intermediate upright 25 of the uppermost intermediate section 2. The lower end of the front intermediate upright 24 and the lower end of the rear intermediate upright 25 of the lowermost intermediate section 2 are respectively detachably connected to the upper end of the bottom ladder 34. The lower end of the front intermediate upright 24 and the lower end of the rear intermediate upright 25 of the upper intermediate section 2 are respectively detachably connected to the upper end of the front intermediate upright 24 and the upper end of the rear intermediate upright 25 of the lower intermediate section 2.

[0040] The number of intermediate longitudinal bars 26 can be determined as needed. The term "multiple bars" refers to two or more bars. In a specific embodiment of this utility model, the number of intermediate longitudinal bars 26 is nine.

[0041] The bottom ladder 34 can have any suitable configuration; please refer to [link / reference]. Figures 1-3As shown, in a specific embodiment of this utility model, the bottom ladder 34 includes a front bottom upright 35, a rear bottom upright 36, and a bottom vertical bar 37. The front bottom upright 35 and the rear bottom upright 36 are spaced apart from each other. The bottom vertical bar 37 is located between the front bottom upright 35 and the rear bottom upright 36 and connects the front bottom upright 35 and the rear bottom upright 36 respectively. There are multiple bottom vertical bars 37, which are spaced apart vertically. The lower part of the front bottom upright 35 is located to the left of the bottom platform 31 and the bottom front guardrail 32, and is connected to the bottom platform 31 and the bottom front guardrail 32 respectively. The lower part of the rear bottom upright 36 is located to the left of the bottom platform 31 and the bottom rear guardrail 33, and is connected to the bottom platform 31 and the bottom rear guardrail 33 respectively. The lower end of the middle ladder 21 is detachably connected to the upper end of the front bottom upright 35 and the upper end of the rear bottom upright 36 respectively. When the number of middle sections 2 is multiple, the lower end of the middle ladder 21 of the lowest middle section 2 is detachably connected to the upper end of the front bottom upright 35 and the upper end of the rear bottom upright 36 respectively. In the case where the intermediate ladder 21 includes a front intermediate upright 24, a rear intermediate upright 25 and an intermediate longitudinal bar 26, the lower end of the front intermediate upright 24 and the lower end of the rear intermediate upright 25 are respectively detachably connected to the upper end of the front bottom upright 35 and the upper end of the rear bottom upright 36.

[0042] The number of bottom longitudinal bars 37 can be determined as needed. In a specific embodiment of this utility model, the number of bottom longitudinal bars 37 is 5.

[0043] The top section 1 may also include any other suitable configuration; see [link to relevant documentation]. Figures 1-3 As shown, in a specific embodiment of this utility model, the top section 1 further includes a top support foot 16, the top support foot 16 is arranged vertically, the left end of the top platform 11 is arranged on the top support foot 16, and there are multiple top support feet 16, which are arranged at intervals from each other.

[0044] The number of top support feet 16 can be determined as needed. The term "multiple" refers to two or more. In a specific embodiment of this utility model, the number of top support feet 16 is two.

[0045] The bottom section 3 may also include any other suitable configuration; see below. Figures 1-3As shown, in a specific embodiment of this utility model, the bottom section 3 further includes a bottom support foot 38, the bottom support foot 38 is arranged vertically, the right end of the bottom platform 31 is arranged on the bottom support foot 38, and there are multiple bottom support feet 38, which are arranged at intervals from each other.

[0046] The number of bottom support feet 38 can be determined as needed; "multiple" refers to two or more. Please refer to [link to relevant documentation]. Figure 1 As shown, in a specific embodiment of this utility model, the number of bottom support feet 38 is two.

[0047] In use, the top section 1 is erected and fixed (e.g., using anchor bolts) on the ground outside the top of the foundation pit. With the top support leg 16 present, the top support leg 16 is supported or inserted into the ground, and the top platform 11 is available for people to stand and pass through. The middle ladder 21 of the middle section 2 is placed against the side wall of the foundation pit. The number of middle sections 2 can be increased or decreased as needed. The bottom section 3 is erected and fixed (e.g., using anchor bolts) on the ground at the bottom of the foundation pit. With the bottom support leg 38 present, the bottom support leg 38 is supported or inserted into the ground, and the bottom platform 31 is available for people to stand and pass through. The bottom section 3 does not have a protective cage, which facilitates people's entry and exit. The bottom section 3 can also be suspended, for example, when used for the construction of a foundation structure.

[0048] When it is necessary to go up or down the foundation pit, for example, when going down into the foundation pit, one enters the middle section 2 through the top platform 11, moves down through the middle ladder 21, and then goes down to the bottom platform 31 through the bottom ladder 34. During this process, one is protected by the top front guardrail 12, the top rear guardrail 13, the top protective cage 14, the middle protective cage 22, the bottom front guardrail 32, and the bottom rear guardrail 33.

[0049] Therefore, this utility model can adjust the length of the safety passage between the upper and lower parts of the foundation pit by increasing or decreasing the number of intermediate sections. The bottom platform allows people to stand and pass through, and the bottom section has no protective cage, making it convenient for people to enter and exit.

[0050] Therefore, this utility model is applicable to foundation pits with limited space. The length of the safety passage between the upper and lower parts of the foundation pit can be adjusted according to the changes in the working face. The bottom of the passage has a place to put your feet, which facilitates entry and exit, and improves the construction efficiency and safety of the foundation pit.

[0051] In summary, the adjustable-length safety passage for the foundation pit of this utility model is convenient and safe to use, improves construction efficiency and safety, has an ingenious design, simple structure, is easy to manufacture, has low manufacturing cost, and is suitable for large-scale promotion and application.

[0052] Therefore, it is evident that the objective of this utility model has been fully and effectively achieved. The function and structural principles of this utility model have been demonstrated and explained in the embodiments. Without departing from the stated principles, any modifications can be made to the implementation methods. Therefore, this utility model includes all modified embodiments based on the spirit and scope of the claims.

Claims

1. A length-adjustable safety passage up and down a foundation pit, characterized in that, It includes the top section, middle section, and bottom section, wherein: The top section includes a top platform, a front top guardrail, a rear top guardrail, and a top cage. The top platform is horizontally arranged along the left-right direction. The front top guardrail and the rear top guardrail are both vertically arranged along the left-right direction and are spaced apart from each other. The front top guardrail and the rear top guardrail are respectively located on the front and rear sides of the top platform. The top cage is vertically arranged, and a first opening is vertically arranged on the left side of the top cage. The first opening is located on the right side of the top platform, the front top guardrail, and the rear top guardrail and is respectively connected to the front top guardrail and the rear top guardrail. The bottom section includes a bottom platform, a bottom front guardrail, a bottom rear guardrail, and a bottom ladder. The bottom platform is horizontally arranged along the left-right direction. The bottom front guardrail and the bottom rear guardrail are both vertically arranged along the left-right direction and are spaced apart from each other. The bottom front guardrail and the bottom rear guardrail are respectively located on the front and rear sides of the bottom platform. The bottom ladder is vertically arranged along the front-back direction. The lower part of the bottom ladder is located to the left of the bottom platform, the bottom front guardrail, and the bottom rear guardrail and is respectively connected to the bottom platform, the bottom front guardrail, and the bottom rear guardrail. The intermediate section includes an intermediate ladder and an intermediate guard cage. The intermediate ladder is vertically arranged along the front-to-back direction. The intermediate guard cage is vertically arranged, and a second opening is vertically arranged on the left side of the intermediate guard cage. The second opening is located on the right side of the intermediate ladder and connects to the intermediate ladder. The intermediate section is located between the top section and the bottom section. The lower right side of the front top guardrail and the lower right side of the rear top guardrail are detachably connected to the upper end of the intermediate ladder. The top guard cage is located above the intermediate guard cage. The lower end of the intermediate ladder is detachably connected to the upper end of the bottom ladder and is used for detachably connecting to the upper end of the intermediate ladder.

2. The length-adjustable safety passage in and out of a foundation pit according to claim 1, wherein, The intermediate sections are multiple, arranged vertically in sequence. In two adjacent intermediate sections, the lower end of the intermediate ladder of the upper intermediate section is detachably connected to the upper end of the intermediate ladder of the lower intermediate section. The intermediate guard cage of the upper intermediate section is located above the intermediate guard cage of the lower intermediate section. The lower right side of the top front guardrail and the lower right side of the top rear guardrail are detachably connected to the upper end of the intermediate ladder of the uppermost intermediate section. The top guard cage is located above the intermediate guard cage of the uppermost intermediate section. The lower end of the intermediate ladder of the lowermost intermediate section is detachably connected to the upper end of the bottom ladder.

3. The length-adjustable safety passageway in and out of a foundation pit according to claim 2, wherein, The number of intermediate sections is 2.

4. The length-adjustable safety passageway in and out of a foundation pit according to claim 1, wherein, The lower right side of the top front guardrail and the upper end of the middle ladder, the lower right side of the top rear guardrail and the upper end of the middle ladder, and the lower end of the middle ladder and the upper end of the bottom ladder are all detachably connected by bolts and nuts. The lower end of the middle ladder is used to detachably connect to the upper end of the middle ladder by bolts and nuts.

5. The length-adjustable safety passageway in and out of a foundation pit according to claim 1, wherein, The intermediate ladder includes a front intermediate upright, a rear intermediate upright, and intermediate longitudinal bars. The front and rear intermediate uprights are spaced apart from each other. The intermediate longitudinal bars are located between the front and rear intermediate uprights and connect to them respectively. There are multiple intermediate longitudinal bars, which are spaced apart vertically. The second opening is located to the right of the front and rear intermediate uprights and connects to them respectively. The lower right side of the top front guardrail and the lower right side of the top rear guardrail are detachably connected to the upper ends of the front and rear intermediate uprights, respectively. The lower ends of the front and rear intermediate uprights are detachably connected to the upper ends of the bottom ladder.

6. The length-adjustable safety passageway in and out of a foundation pit according to claim 5, wherein, The number of intermediate longitudinal bars is 9.

7. The length-adjustable safety passageway in and out of a foundation pit according to claim 1, wherein, The bottom ladder includes a front bottom upright, a rear bottom upright, and bottom longitudinal bars. The front bottom upright and the rear bottom upright are spaced apart from each other. The bottom longitudinal bars are located between the front bottom upright and the rear bottom upright and connect to the front bottom upright and the rear bottom upright respectively. There are multiple bottom longitudinal bars, which are spaced apart vertically. The lower part of the front bottom upright is located to the left of the bottom platform and the bottom front guardrail and connects to the bottom platform and the bottom front guardrail respectively. The lower part of the rear bottom upright is located to the left of the bottom platform and the bottom rear guardrail and connects to the bottom platform and the bottom rear guardrail respectively. The lower end of the middle ladder is detachably connected to the upper end of the front bottom upright and the upper end of the rear bottom upright respectively.

8. The length-adjustable safety access passage of foundation pit up and down as claimed in claim 7, wherein, The number of bottom longitudinal bars is 5.

9. The length-adjustable safety passageway in and out of a foundation pit according to claim 1, wherein, The top section also includes a top support leg, which is vertically arranged. The left end of the top platform is located on the top support leg. There are multiple top support legs, which are spaced apart from each other.

10. The adjustable length safety access to and from a foundation pit according to claim 1, wherein, The bottom section also includes bottom support feet, which are vertically arranged. The right end of the bottom platform is located on the bottom support feet. There are multiple bottom support feet, which are spaced apart from each other.

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