Prefabricated foundation pit crawling ladder for constructional engineering

Abstract

The invention relates to the technical field of building construction, in particular to a prefabricated foundation pit crawling ladder for constructional engineering, square clamping grooves are evenly formed in the front end of a crawling ladder main rod, square clamping blocks are inserted into the square clamping grooves, the square clamping blocks are fixedly connected to a pedal, and the crawling ladder comprises a combined assembling mechanism, a supporting strengthening mechanism and a detection protection mechanism. The combined assembling mechanism can control the combined connection of the ladder stand main rod and the pedal by adjusting the orientation of the opening in the bottom end of the clamping column, so that the ladder stand is assembled and formed without using screws, the pedal is quickly disassembled and assembled by utilizing the change of the orientation of the opening in the bottom end of the clamping column, and the ladder stand is conveniently assembled and formed; the mounting base and the first fixing base are limited by dismounting and mounting the pedals, flexible mounting of the mounting base and the first fixing base is achieved, the mounting height of the first fixing base can be adjusted by inserting circular clamping blocks on the first connecting rods into circular clamping grooves in different positions, and the crawling ladder can adapt to foundation pits of various depths conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a prefabricated foundation pit ladder for construction engineering. Background Art

[0002] During the construction process, especially when carrying out underground projects such as foundation pit construction, construction workers need to frequently go up and down the foundation pit. In order to ensure the safety of construction workers, a stable and reliable access equipment must be provided. The foundation pit ladder is designed to meet this safety demand. The foundation pit ladder plays a vital role in construction. It not only improves construction efficiency, but also ensures the safety of workers.

[0003] The foundation pit is gradually deepened during the construction process, and the depth often changes. Most of the existing ladders are assembled through complex bolts, which are slow to install and inconvenient to adjust the height. They are not suitable for temporary use. In addition, the foundation pit construction environment is usually harsh, with problems such as small space, soft soil, and high humidity. It is inconvenient to fix and the supporting effect is poor.

[0004] For this reason, a prefabricated foundation pit ladder for construction engineering is proposed. Summary of the invention

[0005] The object of the present invention is to provide a prefabricated foundation pit ladder for construction engineering, so as to solve the problems of slow assembly speed and inconvenient fixation due to soft foundation pit soil proposed in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a prefabricated foundation pit ladder for construction engineering, comprising a ladder main pole, the front end of the ladder main pole is evenly provided with square card slots, the square card slots are inserted with square card blocks, the square card blocks are fixedly connected to the pedals, the ladder comprises a combined assembly mechanism, a support and reinforcement mechanism and a detection and protection mechanism, the combined assembly mechanism can control the combined connection of the ladder main pole and the pedals by adjusting the direction of the notch at the bottom end of the card column, so that the ladder can be assembled without using screws, the support and reinforcement mechanism can share the force exerted on the first fixed seat, and can adjust the installation angle, the detection and protection mechanism can detect ladder failure in time, and can provide a buffering force for the ladder to fall.

[0007] Preferably, the combined assembly mechanism includes a rotating cylinder rotatably connected to the inside of the main rod of the ladder, a return spring is arranged inside the rotating cylinder, a limit plate is arranged at the bottom end of the return spring, a clamping column is fixedly connected to the bottom end of the limit plate, the bottom end of the clamping column passes through the rotating cylinder and is inserted into the clamping column groove, the clamping column groove is opened at the upper end of the square clamping block, and a notch is opened at the bottom end of the clamping column.

[0008] Preferably, a gear ring is fixedly provided on the outer side of the rotating drum, a gear is meshed with the gear ring, the gear is fixedly provided on the rotating rod, and the upper end of the rotating rod passes through the main rod of the ladder and is fixedly connected with a handle.

[0009] Preferably, circular slots are evenly opened on the sides of the ladder main rod, and circular blocks are fixedly connected to the vertical plate and the first connecting rod respectively. The vertical plate is fixedly installed on the mounting base, and the first connecting rod is fixedly installed on the first fixing seat.

[0010] Preferably, the support reinforcement mechanism comprises a second connecting rod inserted inside the first connecting rod, a third connecting rod is inserted inside the second connecting rod, and the outer end of the third connecting rod is fixedly connected to the second fixing seat.

[0011] Preferably, the first connecting rod is provided with a first slide track at both upper and lower ends, the first slide track is slidably connected to the inside of the first slide track, the first slide track is fixedly connected to the second connecting rod, the second connecting rod is provided with a second slide track at both upper and lower ends, the second slide track is slidably connected to the inside of the second slide track, and the second slide track is fixedly connected to the third connecting rod.

[0012] Preferably, a first slot is formed at the front end of the first connecting rod, and a second slot is formed at the front end of the second connecting rod.

[0013] Preferably, the detection and protection mechanism includes a slide rail fixedly connected to the main rod of the ladder, a slide plate is slidably connected inside the slide rail, a third slide block is fixedly connected at both ends of the slide block, the third slide block is slidably connected in a third slide groove, the third slide groove is provided on the column, the bottom end of the column passes through the support seat and is fixedly connected with a card plate, the card plate is clamped in the card plate groove, and the card plate groove is provided on the support seat.

[0014] Preferably, a first buffer airbag is provided at the bottom end of the skateboard, the first buffer airbag is fixedly connected to one end of an air pipe, the other end of the air pipe passes through the skateboard and is connected to a second buffer airbag, the second buffer airbag is arranged above the skateboard, and the first buffer airbag and the second buffer airbag are both arranged inside the slide rail.

[0015] Preferably, a first buffer spring is arranged inside the first buffer airbag, and a second buffer spring is arranged inside the second buffer airbag.

[0016] Beneficial effects of the present invention: 1. The present invention designs a combined assembly mechanism and utilizes the change in the direction of the notch at the bottom end of the clamping column to quickly disassemble and assemble the pedal, which is convenient for the assembly and molding of the ladder. The mounting base and the first fixing seat are restricted by the disassembly and assembly of the pedal, so that the mounting base and the first fixing seat can be flexibly installed. Moreover, the circular clamping block on the first connecting rod is inserted into circular clamping grooves at different positions, so that the installation height of the first fixing seat can be adjusted, which is convenient for the ladder to adapt to foundation pits of various depths.

[0017] 2. The present invention realizes flexible adjustment of the position of the second fixed seat by designing a support reinforcement mechanism in conjunction with a combined assembly mechanism and utilizing the telescopic and deflection effects of the second connecting rod and the third connecting rod, so that the second fixed seat can share the force exerted on the first fixed seat, making the force-bearing structure more stable, reducing the influence of the shear force on the first fixed seat, improving the stability of the ladder, and guiding the main supporting force to the external ground at the upper end, thereby reducing the influence of the soft soil and high humidity of the foundation pit on the ladder.

[0018] 3. The present invention designs a detection and protection mechanism in conjunction with a combined assembly mechanism, utilizes the slow conversion of gas and the reaction force of the spring to reduce the descending speed of the ladder main rod, which can not only provide certain protection for personnel to prevent sudden falls, but also promptly remind staff of the occurrence of faults, making it convenient for staff to repair and replace in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is an overall three-dimensional schematic diagram of a prefabricated foundation pit ladder for construction engineering according to an embodiment of the present invention; Figure 2 A prefabricated foundation pit ladder for construction engineering according to an embodiment of the present invention Figure 1 The enlarged cross-sectional diagram at A in the middle; Figure 3 Schematic diagram of an explosion of a combined assembly mechanism of a prefabricated foundation pit ladder for construction engineering according to an embodiment of the present invention Figure 1 ; Figure 4 Schematic diagram of an explosion of a combined assembly mechanism of a prefabricated foundation pit ladder for construction engineering according to an embodiment of the present invention Figure 2 ; Figure 5 This is a schematic diagram of a support reinforcement mechanism for a prefabricated foundation pit ladder for construction engineering according to an embodiment of the present invention; Figure 6 A prefabricated foundation pit ladder for construction engineering according to an embodiment of the present invention Figure 5 The enlarged schematic diagram of point B in the middle; Figure 7 This is an exploded schematic diagram of a detection and protection mechanism for a prefabricated foundation pit ladder for construction engineering according to an embodiment of the present invention; Figure 8The invention is an automatic transposition module for a prefabricated foundation pit ladder for construction engineering. Figure 7 Enlarged schematic diagram at point C in the middle.

[0021] The markings in the figure are: 1. main rod of the ladder; 2. circular slot; 3. circular block; 4. vertical plate; 5. mounting base; 6. first connecting rod; 7. first fixing seat; 8. square slot; 9. square block; 10. pedal; 11. rotating drum; 12. return spring; 13. limit plate; 14. clamping column; 15. notch; 16. clamping column slot; 17. gear ring; 18. gear; 19. rotating rod; 20. handle; 21. second connecting rod; 22. third connecting rod; 23. Second fixed seat; 24. First slideway; 25. First slider; 26. Second slideway; 27. Second slider; 28. First slot; 29. ​​Second slot; 30. Slide rail; 31. Slide plate; 32. Third slider; 33. Third slot; 34. Post; 35. Pallet; 36. Pallet slot; 37. Support seat; 38. First buffer airbag; 39. Air pipe; 40. Second buffer airbag; 41. First buffer spring; 42. Second buffer spring. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] See also Figures 1 to 8The present invention provides a technical solution: a prefabricated foundation pit ladder for construction engineering, comprising a ladder main pole, square card slots 8 are evenly opened at the front end of the ladder main pole 1, square card blocks 9 are inserted into the square card slots 8, and the square card blocks 9 are fixedly connected to the pedals 10. The ladder comprises a combined assembly mechanism, a support and reinforcement mechanism, and a detection and protection mechanism. The combined assembly mechanism can control the combined connection of the ladder main pole 1 and the pedals 10 by adjusting the direction of the notch 15 at the bottom end of the card column 14, so that the ladder can be assembled without using screws. The support and reinforcement mechanism can share the force exerted on the first fixing seat 7 and can adjust the installation angle. The detection and protection mechanism can detect ladder failures in time and can provide a buffer force for the ladder to fall.

[0025] As an embodiment of the present invention, Figure 2 and Figure 3 as well as Figure 4As shown, because some foundation pits are gradually deepened and the depth often changes, most of the existing ladders are assembled by complex bolts, the installation speed is slow, and it is not suitable for temporary use. The combined assembly mechanism includes a rotating drum 11 rotatably connected to the inside of the ladder main rod 1, and a reset spring 12 is arranged inside the rotating drum 11. A limit plate 13 is arranged at the bottom end of the reset spring 12. A clamping column 14 is fixedly connected to the bottom end of the limit plate 13. The bottom end of the clamping column 14 passes through the rotating drum 11 and is inserted into the clamping column groove 16. The clamping column groove 16 is provided at the upper end of the square clamping block 9. A notch 15 is provided at the bottom end of the clamping column 14. A toothed ring 17 is fixedly provided on the outer side of the rotating drum 11. The toothed ring 17 is meshed with a gear 18. The gear 18 is fixedly arranged on the rotating rod 1 9, the upper end of the rotating rod 19 passes through the ladder main rod 1 and is fixedly connected with a handle 20, circular card grooves 2 are provided at both ends of the side of the ladder main rod 1, and circular card blocks 3 are provided inside the circular card grooves 2, and the circular card blocks 3 are respectively fixedly connected to the vertical plate 4 and the first connecting rod 6, and the vertical plate 4 is fixedly installed on the mounting base 5, and the first connecting rod 6 is fixedly installed on the first fixing seat 7. First, the circular card blocks 3 on the vertical plate 4 and the first connecting rod 6 are respectively inserted into the circular card grooves 2 provided on the ladder main rod 1, so that the mounting base 5 and the first fixing seat 7 are respectively rotatably connected to the ladder main rod 1, and then the square card block 9 on the pedal 10 is gradually inserted into the square card groove 8, and the square card block 9 is pushed along the notch 15 on the card column 14. The clamping column 14 is moved to make the clamping column 14 enter the rotating drum 11, and then the restoring force of the reset spring 12 drives the clamping column 14 to be inserted into the clamping column groove 16 opened at the upper end of the square clamping block 9 through the limit plate 13, so that the plurality of sets of pedals 10 are fixedly installed on the two sets of ladder main rods 1, and the installation of the plurality of sets of pedals 10 will also limit the mounting base 5 and the first fixing seat 7, so that the mounting base 5 and the first fixing seat 7 will not be separated from the two sets of ladder main rods 1, and finally the handle 20 is rotated 180 degrees, and the handle 20 drives the gear 18 to rotate through the rotating rod 19. Because the gear 18 is meshed with the gear ring 17, and the gear ring 17 is fixedly set on the rotating drum 11, the handle 20 drives the rotating drum 11 to rotate, and because the limit plate 13 is not circular, Therefore, the rotating drum 11 drives the clamping column 14 to rotate 180 degrees through the limit plate 13, so that the notch 15 at the bottom end of the clamping column 14 faces inward. At this time, the square clamping block 9 can push the clamping column 14 through the notch 15 at the bottom end of the clamping column 14 again, thereby disassembling the pedal 10, which is beneficial to utilizing the change in the direction of the notch 15 at the bottom end of the clamping column 14 to quickly disassemble and assemble the pedal 10, which is convenient for the assembly and molding of the ladder. The mounting base 5 and the first fixing seat 7 are restricted by the disassembly and assembly of the pedal 10, so that the mounting base 5 and the first fixing seat 7 can be flexibly installed, and the circular clamping block 3 on the first connecting rod 6 is inserted into the circular slot 2 at different positions to adjust the installation height of the first fixing seat 7, so that the ladder can adapt to foundation pits of various depths.

[0026] As an embodiment of the present invention, Figure 1 and Figure 5 as well as Figure 6 As shown, the support and strengthening mechanism includes a second connecting rod 21 inserted into the first connecting rod 6, a third connecting rod 22 is inserted into the second connecting rod 21, and the outer end of the third connecting rod 22 is fixedly connected to a second fixing seat 23, first slideways 24 are provided at both upper and lower ends of the first connecting rod 6, a first slider 25 is slidably connected inside the first slideway 24, the first slider 25 is fixedly connected to the second connecting rod 21, second slideways 26 are provided at both upper and lower ends of the second connecting rod 21, a second slider 27 is slidably connected inside the second slideway 26, and the second slider 27 is fixedly connected to the third connecting rod 22, a first slot 28 is provided at the front end of the first connecting rod 6, and a second slot 29 is provided at the front end of the second connecting rod 21, firstly, the mounting base 5 and the first fixing seat 7 are respectively fixed at the upper and lower sides of the corner of the foundation pit through the pile holes at the upper ends, and then the second fixing seat 23 is pulled to gradually separate one end of the second connecting rod 21 from the first connecting rod 6 and one end of the third connecting rod 22 from the second connecting rod 21. , and the second connecting rod 21 is limited by the first slide 24 and the first slider 25 to prevent the second connecting rod 21 from being completely separated from the first connecting rod 6, and the third connecting rod 22 is limited by the second slide 26 and the second slider 27 to prevent the third connecting rod 22 from being completely separated from the second connecting rod 21. Finally, the deflection of the second connecting rod 21 and the third connecting rod 22 is achieved through the first slot 28 opened on the first connecting rod 6 and the second slot 29 opened on the second connecting rod 21, so as to adjust the installation position of the second fixing seat 23, which is convenient for the stable installation of the second fixing seat 23, and is conducive to utilizing the telescopic and deflection effects of the second connecting rod 21 and the third connecting rod 22 to realize the flexible adjustment of the position of the second fixing seat 23, so that the second fixing seat 23 can share the force exerted on the first fixing seat 7, so that the force-bearing structure is more stable, the influence of the shear force on the first fixing seat 7 is reduced, the stability of the ladder is improved, and the main supporting force is guided to the external ground at the upper end, so as to reduce the influence of the soft soil and high humidity of the foundation pit on the ladder.

[0027] As an embodiment of the present invention, Figure 2 and Figure 7 as well as Figure 8As shown, the detection protection mechanism includes a slide rail 30 fixedly connected to the ladder main rod 1, a slide plate 31 is slidably connected inside the slide rail 30, both ends of the slide plate 31 are fixedly connected to a third slider 32, the third slider 32 is slidably connected in a third slide groove 33, the third slide groove 33 is arranged on a column 34, the bottom end of the column 34 passes through a support seat 37 and is fixedly connected with a card plate 35, the card plate 35 is clamped in a card plate groove 36, the card plate groove 36 is arranged on the support seat 37, and a first buffer airbag 38 is arranged at the bottom end of the slide plate 31. The bag 38 is fixedly connected to one end of the air pipe 39, and the other end of the air pipe 39 passes through the slide plate 31 and is connected to the second buffer air bag 40. The second buffer air bag 40 is arranged above the slide plate 31. The first buffer air bag 38 and the second buffer air bag 40 are both arranged inside the slide rail 30. The first buffer air bag 38 is provided with a first buffer spring 41, and the second buffer air bag 40 is provided with a second buffer spring 42. When the upper end of the ladder main rod 1 is damaged or moved, the upper end of the ladder main rod 1 begins to fall under the action of gravity. The ladder main rod 1 is slidably connected to the slide plate 31 through the slide rail 30, and the slide plate 31 is slidably connected to the column 34 by means of the third slider 32 and the third slide groove 33. Therefore, the design of the column 34 limits the movement of the ladder main rod 1, that is, the ladder main rod 1 can only slide in the slide plate 31 through the slide rail 30 to achieve the descending action, and then the slide plate 31 squeezes the first buffer airbag 38. Because the gas in the first buffer airbag 38 can only be discharged into the second buffer airbag 40 through the smaller air delivery pipe 39, the ladder main rod 1 can only descend very slowly. At the same time, the restoring force of the first buffer spring 41 in the first buffer airbag 38 will gradually increase, further providing buffering force to reduce the descending speed of the ladder main rod 1. Similarly, when the bottom end of 01 is damaged or moved, the second buffer airbag 40 and the second buffer spring 42 will play a role, which is beneficial to utilize the slow conversion of gas and the reaction force of the spring to reduce the descending speed of the ladder main rod 1, which can not only provide certain protection for personnel to avoid sudden falls, but also promptly remind staff of the occurrence of faults, which is convenient for staff to repair and replace in time.

[0028] Working principle: First, insert the circular blocks 3 on the vertical plate 4 and the first connecting rod 6 into the circular slots 2 opened on the ladder main rod 1, respectively, so that the mounting base 5 and the first fixing seat 7 are respectively rotated and connected to the ladder main rod 1, and then gradually insert the square block 9 on the pedal 10 into the square slot 8, and the square block 9 pushes the clamping column 14 along the notch 15 on the clamping column 14, so that the clamping column 14 enters the rotating drum 11, and then the restoring force of the reset spring 12 drives the clamping column 14 to be inserted into the notch 15 opened at the upper end of the square block 9 through the limit plate 13, so that several groups of pedals 10 are fixedly installed on the two groups of ladder main rods 1, and the installation of several groups of pedals 10 is also The mounting base 5 and the first fixing base 7 will be restricted so that the mounting base 5 and the first fixing base 7 will not be separated from the two sets of ladder main rods 1. Finally, the handle 20 is rotated 180 degrees. The handle 20 drives the gear 18 to rotate through the rotating rod 19. Because the gear 18 is meshed with a gear ring 17, and the gear ring 17 is fixedly arranged on the rotating drum 11, the handle 20 drives the rotating drum 11 to rotate. Because the limiting plate 13 is not circular, the rotating drum 11 drives the clamping column 14 to rotate 180 degrees through the limiting plate 13, so that the notch 15 at the bottom end of the clamping column 14 faces inward. At this time, the square clamping block 9 can push the clamping column 14 through the notch 15 at the bottom end of the clamping column 14 again, thereby disassembling the pedal 10. First, the mounting base 5 and the first fixing seat 7 are fixed at the upper and lower parts of the corner of the foundation pit through the pile holes at the upper ends, and then the second fixing seat 23 is pulled to make one end of the second connecting rod 21 gradually separate from the first connecting rod 6 and one end of the third connecting rod 22 gradually separate from the second connecting rod 21, and the second connecting rod 21 is restricted by the first slide 24 and the first slider 25 to prevent the second connecting rod 21 from completely separating from the first connecting rod 6, and the third connecting rod 22 is restricted by the second slide 26 and the second slider 27 to prevent the third connecting rod 22 from completely separating from the second connecting rod 21, and finally the second connecting rod 21 and the third connecting rod 22 are deflected by the first slot 28 provided on the first connecting rod 6 and the second slot 29 provided on the second connecting rod 21, so as to adjust the installation position of the second fixing seat 23, so as to facilitate the stable installation of the second fixing seat 23; When the upper end of the ladder main rod 1 is damaged or moved, the upper end of the ladder main rod 1 begins to descend under the action of gravity, and the ladder main rod 1 is slidably connected to the slide plate 31 through the slide rail 30, and the slide plate 31 is slidably connected to the column 34 by means of the third slider 32 and the third slide groove 33. Therefore, the design of the column 34 limits the movement of the ladder main rod 1, that is, the ladder main rod 1 can only descend by sliding in the slide plate 31 through the slide rail 30, and then the slide plate 31 squeezes the first buffer airbag 38. Because the gas in the first buffer airbag 38 can only be discharged into the second buffer airbag 40 through the smaller air supply pipe 39, the ladder main rod 1 can only descend very slowly. At the same time, the restoring force of the first buffer spring 41 in the first buffer airbag 38 will gradually increase, further providing buffering force and reducing the descending speed of the ladder main rod 1. Similarly, when the bottom end of 01 is damaged or moved, the second buffer airbag 40 and the second buffer spring 42 play a role.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A prefabricated foundation pit ladder for construction engineering, comprising a ladder main rod (1), the front end of the ladder main rod (1) is evenly provided with square card slots (8), the square card slots (8) are inserted with square card blocks (9), and the square card blocks (9) are fixedly connected to a pedal (10), characterized in that: The ladder comprises a combined assembly mechanism, a support reinforcement mechanism and a detection and protection mechanism. The combined assembly mechanism can control the combined connection between the ladder main rod (1) and the pedal (10) by adjusting the direction of the notch (15) at the bottom end of the clamping column (14), so that the ladder can be assembled without using screws. The support reinforcement mechanism can share the force exerted on the first fixing seat (7) and can adjust the installation angle. The detection and protection mechanism can detect ladder failure in a timely manner and can provide a buffer force for the ladder to fall.

2. A prefabricated foundation pit ladder for construction engineering according to claim 1, characterized in that: The combined assembly mechanism comprises a rotating cylinder (11) rotatably connected to the inside of the ladder main rod (1), a return spring (12) is arranged inside the rotating cylinder (11), a limit plate (13) is arranged at the bottom end of the return spring (12), a clamping column (14) is fixedly connected to the bottom end of the limit plate (13), the bottom end of the clamping column (14) passes through the rotating cylinder (11) and is inserted into a clamping column groove (16), the clamping column groove (16) is provided at the upper end of the square clamping block (9), and a notch (15) is provided at the bottom end of the clamping column (14).

3. A prefabricated foundation pit ladder for construction engineering according to claim 2, characterized in that: A toothed ring (17) is fixedly provided on the outer side of the rotating drum (11), the toothed ring (17) is meshed with a gear (18), the gear (18) is fixedly provided on a rotating rod (19), the upper end of the rotating rod (19) passes through the ladder main rod (1) and is fixedly connected to a handle (20).

4. The prefabricated foundation pit ladder for construction engineering according to claim 1, characterized in that: Circular clamping grooves (2) are evenly formed on the side of the ladder main rod (1), and circular clamping blocks (3) are clamped inside the circular clamping grooves (2). The circular clamping blocks (3) are respectively fixedly connected to the vertical plate (4) and the first connecting rod (6), the vertical plate (4) is fixedly mounted on the mounting base (5), and the first connecting rod (6) is fixedly mounted on the first fixing seat (7).

5. The prefabricated foundation pit ladder for construction engineering according to claim 1, characterized in that: The support reinforcement mechanism comprises a second connecting rod (21) inserted into the interior of the first connecting rod (6), a third connecting rod (22) inserted into the interior of the second connecting rod (21), and a second fixing seat (23) fixedly connected to the outer end of the third connecting rod (22).

6. A prefabricated foundation pit ladder for construction engineering according to claim 5, characterized in that: The first connecting rod (6) is provided with a first slideway (24) at both upper and lower ends, a first slider (25) is slidably connected inside the first slideway (24), the first slider (25) is fixedly connected to the second connecting rod (21), the second connecting rod (21) is provided with a second slideway (26) at both upper and lower ends, a second slider (27) is slidably connected inside the second slideway (26), and the second slider (27) is fixedly connected to the third connecting rod (22).

7. A prefabricated foundation pit ladder for construction engineering according to claim 6, characterized in that: A first slot (28) is formed at the front end of the first connecting rod (6), and a second slot (29) is formed at the front end of the second connecting rod (21).

8. The prefabricated foundation pit ladder for construction engineering according to claim 7, characterized in that: The detection and protection mechanism comprises a slide rail (30) fixedly connected to the ladder main rod (1); a slide plate (31) is slidably connected inside the slide rail (30); both ends of the slide plate (31) are fixedly connected to third sliders (32); the third slider (32) is slidably connected in a third slide groove (33); the third slide groove (33) is provided on a column (34); the bottom end of the column (34) passes through a support seat (37) and is fixedly connected to a clamping plate (35); the clamping plate (35) is clamped in a clamping plate groove (36); and the clamping plate groove (36) is provided on the support seat (37).

9. A prefabricated foundation pit ladder for construction engineering according to claim 8, characterized in that: A first buffer airbag (38) is arranged at the bottom end of the slide plate (31), the first buffer airbag (38) is fixedly connected to one end of an air supply pipe (39), the other end of the air supply pipe (39) passes through the slide plate (31) and is connected to a second buffer airbag (40), the second buffer airbag (40) is arranged above the slide plate (31), and the first buffer airbag (38) and the second buffer airbag (40) are both arranged inside the slide rail (30).

10. A prefabricated foundation pit ladder for construction engineering according to claim 9, characterized in that: A first buffer spring (41) is arranged inside the first buffer airbag (38), and a second buffer spring (42) is arranged inside the second buffer airbag (40).

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