Open cut tunnel deep foundation pit passing stair

Abstract

The utility model relates to an open-cut tunnel deep foundation pit passing stair which is composed of a foundation structure, a protection structure and a stair structure. The foundation structure is fixed to an enclosure structure on the upper portion of a foundation pit and comprises a foundation plate, a foundation frame, supporting rods and the like. A plurality of bolt holes are formed in the foundation plate, and the foundation plate is installed on a foundation pit side wall enclosure structure or a foundation pit upper portion ground structure through anchor bolts. The foundation frame is of a rectangular frame structure and is provided with an inserting groove used for installing the protection structure, and meanwhile the foundation frame is further provided with an installation platform used for installing the stairs. The protection structure is installed on the base structure and comprises a first protection frame and a second protection frame. The protection frame is further provided with an installation block and a fixing hole which are used for installing and fixing the stair structure. The stair structure is installed in the protection structure and composed of stair rods and stair plates. Through the design that the upper portion is stressed, the device is suitable for passing of the foundation pit in the excavation process, meanwhile, a modular structure is used, installation, disassembly and adjustment are convenient, and the device adapts to changes of the depth of the foundation pit.

Description

Technical Field

[0001] The utility model belongs to the field of deep foundation pit construction equipment, in particular to a deep foundation pit passage staircase for an open-cut tunnel. Background Art

[0002] During open-cut tunnel construction, the excavation of deep foundation pits is a critical step in the project's progress. However, as the depth of the foundation pit continues to increase, providing workers with safe and convenient access to and from the pit becomes a daunting challenge. Traditional staircase designs typically adopt a bottom-bearing approach, where the weight of the stairs and the load of people passing through are primarily borne by the staircase's bottom support structure. However, this design has many shortcomings in deep foundation pit construction. First, bottom-bearing stairs are generally unusable during the excavation process due to the lack of a solid foundation at the bottom. They can only be used for personnel to pass through the excavated pit. At the same time, as the foundation pit continues to deepen, the depth of the pit's horseways or excavation steps is constantly changing, requiring the staircase height to be flexibly adjusted to meet daily use. Utility Model Content

[0003] The purpose of the utility model is to provide a staircase for accessing a deep foundation pit of an open-cut tunnel, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a deep foundation pit access staircase for an open-cut tunnel, comprising a foundation structure, a protective structure and a staircase structure, the foundation structure comprising a foundation plate, a plurality of bolt holes being provided on the foundation plate, anchor bolts being provided in the bolt holes, a foundation frame being provided on the foundation plate, two first slots and two second slots being provided on the foundation frame, a mounting platform being provided on each side of the foundation frame, a platform ladder being provided in the mounting platform, a first support rod being provided at the bottom of the foundation plate, and a second support rod being provided on the first support rod; the protective structure comprising a first protective frame and a second protective frame, a plurality of first protective railings being provided on the first protective frame, eight mounting blocks being provided on the first protective frame, a plurality of first fixing holes being provided on both sides of the first protective frame, a first upper connecting block being provided on the upper part of the first protective frame, a first lower connecting block being provided on the lower part, a plurality of second protective railings being provided on the second protective frame, a plurality of second fixing holes being provided on both sides of the second protective frame, a second upper connecting block being provided on the upper part of the second protective frame, and a second lower connecting block being provided on the lower part; the staircase structure comprises stair rods and stair plates.

[0005] As a preferred embodiment of the present invention, the basic frame is a rectangular frame structure, the first slot is arranged on the short side of the rectangle, and the second slot is arranged on the long side of the rectangle.

[0006] As a preferred embodiment of the present invention, the height of the installation platform is lower than the base frame.

[0007] As a preferred embodiment of the present invention, one end of the second support rod is connected to the lower part of the first support rod, and the other end is connected to the base frame.

[0008] As a preferred embodiment of the present invention, the first protective frame is a rectangular frame structure, and the length of the short side of the rectangle is the same as the length of the first slot.

[0009] As a preferred embodiment of the present invention, the second protective frame is a rectangular frame structure, and the length of the short side of the rectangle is the same as the length of the second slot.

[0010] As a preferred embodiment of the present invention, the protective structure further includes a first fixing bolt, which is installed on the first upper connecting block and the second upper connecting block.

[0011] As a preferred embodiment of the present invention, the protective structure further includes a second fixing bolt, which is installed on the first fixing hole and the second fixing hole.

[0012] The utility model provides a staircase for accessing deep foundation pits in open-cut tunnels, which has the following beneficial effects:

[0013] This patent proposes a staircase for deep excavation tunnels, using an upper foundation structure to support the load. Compared to traditional bottom-supported staircases, this structure is more stable in deep excavation environments and eliminates the need to retain soil in the staircase area during use, making it more adaptable. Furthermore, the patent's staircase structure utilizes a modular design, allowing installation and disassembly to be completed by a small number of workers in the safe environment above the excavation, eliminating the need to transport materials into the excavation, thereby increasing construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 It is a front view of the utility model;

[0016] Figure 3 It is a right side view of the utility model;

[0017] Figure 4 It is a top view of the utility model;

[0018] Figure 5 It is a structural diagram of the basic structure of the utility model;

[0019] Figure 6 This is a front view of the first protective frame of the utility model;

[0020] Figure 7 This is a front view of the second protective frame of the present invention;

[0021] Among them: 11. Base plate, 12. Base frame, 13. Anchor bolt, 14. First slot, 15. Second slot, 16. Mounting platform, 17. Platform ladder, 18. First support rod, 19. Second support rod, 21. First protective frame, 22. First protective railing, 23. Mounting block, 24. First fixing hole, 25. First upper connecting block, 26. First lower connecting block, 27. Second protective frame, 28. Second protective railing, 29. Second fixing hole, 210. Second upper connecting block, 211. Second lower connecting block, 212. First fixing bolt, 213. Second fixing bolt, 31. Stair rod, 32. Stair board. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-7 , a specific implementation of the utility model is:

[0024] A staircase for accessing a deep foundation pit in an open-cut tunnel consists of a foundation structure, a protective structure and a staircase structure. The foundation structure is fixed to a retaining structure above the foundation pit, the protective structure is installed on the foundation structure, and the staircase structure is installed inside the protective structure, forming a ladder cage structure with upper force applied, providing stairs for workers to go up and down during the foundation pit excavation process.

[0025] The foundation structure includes a foundation plate 11, which is provided with a plurality of bolt holes and is installed on the foundation pit side wall retaining structure or the upper ground structure of the foundation pit through anchor bolts 13. A foundation frame 12 is provided on the foundation plate 11. The foundation frame 12 is a rectangular frame structure. A first slot 14 is provided on each of the two short sides of the rectangle, and a second slot 15 is provided on each of the two long sides of the rectangle. A mounting platform 16 is provided on each side of the foundation frame 12. The mounting platform 16 is a working platform surrounded by guardrails. Its height is lower than the foundation frame 12. A platform ladder 17 is provided in the mounting platform 16 for allowing workers to move from the ground to the mounting platform 16. A first support rod 18 is provided vertically downward at the bottom of the foundation plate 11, and a second support rod 19 is provided on the first support rod 18. One end of the second support rod 19 is connected to the lower part of the first support rod 18, and the other end is connected to the foundation frame 12.

[0026] The protective structure includes a first protective frame 21 and a second protective frame 27. The first protective frame 21 is a rectangular frame structure, the shorter side of the rectangle being the same length as the first slot 14. The first protective frame 21 is provided with a plurality of transverse first protective railings 22. The first protective frame 21 is provided with eight mounting blocks 23, symmetrically located at the four corners and the center of the first protective frame 21, for mounting the staircase structure. Multiple first fixing holes 24 are provided on both sides of the first protective frame 21. A first upper connecting block 25 is provided on the upper portion of the first protective frame 21, and a first lower connecting block 26 is provided on the lower portion. The two first protective frames 21 can be connected to each other via their respective first upper connecting blocks 25 and first lower connecting blocks 26. The second protective frame 27 is a rectangular frame structure, the shorter side of the rectangle being the same length as the second slot 15. Multiple transverse second protective railings 28 are provided on the second protective frame 27. Multiple second fixing holes 29 are provided on both sides of the second protective frame 27. A second upper connecting block 210 is provided on the upper portion of the second protective frame 27 , and a second lower connecting block 211 is provided on the lower portion thereof. The two second protective frames 27 can be connected to each other through their respective second upper connecting blocks 210 and second lower connecting blocks 211 .

[0027] The stair structure includes a stair rod 31 and a stair tread 32 . The end of the stair rod 31 is mounted on the mounting block 23 on the first protective frame 21 by bolts, and the stair tread 32 is fixed on the stair rod 31 .

[0028] In this embodiment, the present invention is installed on the retaining structure on the side of a deep foundation pit in an open-cut tunnel. Anchor bolts 13 are pre-embedded in the crown beams of the foundation pit retaining piles. After the foundation pit is excavated, the foundation plate 11 is installed on the pre-embedded anchor bolts 13. At this point, the first support rods 18 are supported on the foundation pit sidewall support structure. The foundation plate 11 and the first support rods 18 form a stable structure that serves as the load-bearing foundation of the present invention. The first and second protective frames 21 and 27 are inserted into the two first slots 14 and two second slots 15, respectively. The first fixing bolts 212 are inserted into the first upper connecting block 25 and the second upper connecting block 210, securing the first and second protective frames 21 and 27 to the foundation frame 12. Workers install the staircase structure on the installation platform 16, installing the staircase rods 31 on the installation block 23 and the second fixing bolts 213 in the first fixing holes 24 and the second fixing holes 29, securing the relative positions of the first and second protective frames 21 and 27. After the stair rails 31 and second fixing bolts 213 of one level are installed, remove the first fixing bolts 212 and install the first and second protective frames 21 and 27 of the next level. Repeat these steps until the staircase height matches the pit depth. Finally, install the first fixing bolts 212 on the topmost first and second protective frames 21 and 27. As the pit depth changes during excavation, the protective structures and staircase structures can be installed or removed to ensure safe passage for workers.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A staircase for deep foundation pit of open-cut tunnel, characterized in that: The invention is composed of a basic structure, a protective structure and a staircase structure, wherein the basic structure comprises a basic plate (11), a plurality of bolt holes are provided on the basic plate (11), anchor bolts (13) are provided in the bolt holes, a basic frame (12) is provided on the basic plate (11), two first slots (14) and two second slots (15) are provided on the basic frame (12), a mounting platform (16) is provided on each side of the basic frame (12), a platform ladder (17) is provided in the mounting platform (16), a first support rod (18) is provided at the bottom of the basic plate (11), and a second support rod (19) is provided on the first support rod (18); the protective structure comprises a first protective frame (21) and a second protective frame (27), the first support rod (18) and the second support rod (19) are provided on the first support rod (19 ... A plurality of first guardrails (22) are provided on a guard frame (21), eight mounting blocks (23) are provided on the first guard frame (21), a plurality of first fixing holes (24) are provided on both sides of the first guard frame (21), a first upper connecting block (25) is provided on the upper portion of the first guard frame (21), and a first lower connecting block (26) is provided on the lower portion thereof; a plurality of second guardrails (28) are provided on a second guard frame (27), a plurality of second fixing holes (29) are provided on both sides of the second guard frame (27), a second upper connecting block (210) is provided on the upper portion of the second guard frame (27), and a second lower connecting block (211) is provided on the lower portion thereof; and the stair structure comprises stair rods (31) and stair treads (32).

2. The open-cut tunnel deep foundation pit access staircase according to claim 1, characterized in that: The basic frame (12) is a rectangular frame structure, the first slot (14) is arranged on the short side of the rectangle, and the second slot (15) is arranged on the long side of the rectangle.

3. The open-cut tunnel deep foundation pit access staircase according to claim 1, characterized in that: The height of the installation platform (16) is lower than that of the base frame (12).

4. The open-cut tunnel deep foundation pit access staircase according to claim 1, characterized in that: One end of the second support rod (19) is connected to the lower part of the first support rod (18), and the other end is connected to the base frame (12).

5. The open-cut tunnel deep foundation pit access staircase according to claim 1, characterized in that: The first protection frame (21) is a rectangular frame structure, and the length of the short side of the rectangle is the same as the length of the first slot (14).

6. The open-cut tunnel deep foundation pit access staircase according to claim 1, characterized in that: The second protection frame (27) is a rectangular frame structure, and the length of the short side of the rectangle is the same as the length of the second slot (15).

7. The open-cut tunnel deep foundation pit access staircase according to claim 1, characterized in that: The protective structure further comprises a first fixing bolt (212), which is mounted on the first upper connecting block (25) and the second upper connecting block (210).

8. The open-cut tunnel deep foundation pit access staircase according to claim 1, characterized in that: The protective structure further comprises a second fixing bolt (213), which is installed on the first fixing hole (24) and the second fixing hole (29).

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