An adjustable height construction safety ladder

Abstract

The utility model provides a kind of adjustable height's construction safety ladder stand, solve the existing construction safety ladder stand usually adopt inherent rigid structure, it is inconvenient to carry out height adjustment, cannot be adjusted with construction progress synchronously, and cannot be adjusted applicable with the construction topography of different height problem.The utility model is through the structure design of unique "fixed ladder sliding suit in lift", cooperate multiple pinhole locking mechanism, the quick, stepless, reliable adjustment of ladder stand height is realized, so that ladder stand can accurately follow construction progress synchronous adjustment, solve the safety blind area and the low efficiency question caused by the height mismatch of traditional fixed ladder stand, the flexible adjustability of height simultaneously, so that the ladder stand can be widely used in different depth's foundation pit, different height's side slope and multiple different height's construction topography, very strong universality, single set of equipment can satisfy diversified construction demand.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to an adjustable height construction safety ladder. Background Technology

[0002] In highway construction, complex slope terrain such as high road cut slopes, bridge cone slopes, culvert foundation pits, and tunnel entrance slopes often necessitates the installation of construction safety ladders to ensure the safe passage of personnel and equipment. Traditional construction safety ladders mostly employ fixed-height structures, making them ill-suited to the complex terrain and dynamically changing elevations of highway construction projects. For example, during the graded excavation and anchor frame beam protection of high road slopes, the work platform needs to be lowered step by step along with the excavation surface. In culvert construction, the depth of the foundation pit also continuously changes with the foundation excavation. Existing construction safety ladders typically use inherent rigid structures, making height adjustment difficult and unable to synchronize with the construction progress. Furthermore, they are unsuitable for various complex slope terrains, leading to frequent disassembly and re-erection, which affects construction efficiency and creates safety hazards.

[0003] Meanwhile, the complex sloping terrain makes it impossible to install effective vertical support components at the bottom of the ladder, limiting the application of conventional adjustable-height ladders. For example, Chinese Utility Model Patent Application No. 202121420377.4 discloses an adjustable-height mobile ladder, which consists of a mobile ladder, a lifting ladder, and fixed handles. The mobile ladder and the lifting ladder are connected by the fixed handles. This adjustable-height mobile ladder has a simple structure, is easy to manufacture, has a stable structure, and can be used repeatedly for a long time. The ladder height can be adjusted according to needs, making it highly adaptable. The ladder is equipped with diagonal guardrails, horizontal guardrails, handles, and platform guardrails, which can effectively improve the safety of users when using the ladder. The height adjustment method is simple and easy for personnel to master; the universal wheels at the bottom facilitate the movement of the ladder. Although the device achieves height adjustment through a combination of movable ladders, lifting ladders, and fixed handles, and is equipped with safety facilities such as inclined guardrails and horizontal guardrails, its bottom relies on casters for support and movement. The device can only be used stably on flat and solid ground. However, in sloping, soft, or uneven construction surfaces such as slopes and foundation pits, the casters cannot provide effective support, resulting in insufficient overall stability and a risk of overturning. Therefore, it is not suitable for the aforementioned complex sloping terrain. Utility Model Content

[0004] To address the problems in the background art where existing construction safety ladders typically employ inherent rigid structures, making height adjustment inconvenient, unable to be synchronized with construction progress, and unsuitable for adapting to different construction terrains, this utility model proposes an adjustable-height construction safety ladder.

[0005] The technical solution of this utility model is: an adjustable height construction safety ladder, including a fixed ladder and a lifting ladder. The fixed ladder is inclined to the ground and serves as the supporting base of the safety ladder. The lifting ladder is slidably mounted on the fixed ladder, and the overall height of the safety ladder is adjusted by the relative sliding of the two. A locking mechanism is provided between the fixed ladder and the lifting ladder to lock and fix the fixed ladder and the lifting ladder after the height is adjusted.

[0006] Preferably, the fixed ladder includes two fixed ladder beams that are arranged in parallel and spaced apart, and a plurality of first steps that are evenly distributed along the length direction are fixed between the two fixed ladder beams. The elevator includes two parallel elevator beams spaced apart on the left and right. The two elevator beams are T-shaped steels with the middle wing plates facing each other. The elevator beams form an upper wing groove and a lower wing groove through the middle wing plates. The two fixed elevator beams are slidably installed in the upper wing groove of the elevator beams respectively. A limiting plate is fixedly installed above the bottom end of the lifting ladder beam, and the fixed ladder beam is slidably positioned between the limiting plate and the upper wing groove of the lifting ladder beam.

[0007] Preferably, the locking structure includes a plurality of first pin holes that are spaced apart and open to the left and right along the extension direction on the first ladder beam, and a plurality of second pin holes that are spaced apart and open to the left and right along the extension direction on the second ladder beam. The plurality of first pin holes can correspond one-to-one with the plurality of second pin holes, and a perforated pin is inserted into the lowermost second pin hole and its corresponding first pin hole.

[0008] Preferably, a plurality of second steps are fixedly provided between the lower wing grooves of the two lifting ladder beams, which are evenly distributed along their length, and the first steps and the second steps are offset from each other along the vertical direction of the safety ladder. The first and second pedals have a flat tread surface on one side, and when they are set up at an angle of °, the tread surface is parallel to the horizontal plane.

[0009] Preferably, the bottom of the elevator is provided with an adjustable support mechanism, which includes a support rod. The top of the support rod is hinged to the bottom of the elevator through a rotating connector to achieve angle adjustment. The support rod is made of hollow steel tube. The top of the adjusting screw is inserted into the cavity at the bottom of the support rod. A threaded sleeve is threaded on the adjusting screw. The top of the threaded sleeve rests against the bottom of the support rod. An operating lever is fixed on the threaded sleeve.

[0010] Preferably, the rotating connector includes a fixed shaft, which is laterally fixed to the bottom end of the lower wing groove of the lifting beam. A rotatable sleeve is sleeved in the middle of the fixed shaft, and the top end of the support rod is fixedly connected to the sleeve. An angle compensation rod is fixed between the sleeve and the support rod, and the angle compensation rod and the support rod are set perpendicular to each other.

[0011] Preferably, a support pad is fixed at the bottom end of the adjusting screw.

[0012] Preferably, the two ends of the fixed shaft pass through the lifting ladder beam and are respectively provided with rollers, and the bottom of the rollers is lower than the fixed ladder beam.

[0013] Preferably, the lifting ladder beam is fixedly equipped with an upward-extending safety guardrail.

[0014] Preferably, the bottom end of the first ladder beam of the fixed ladder is fixed with a reinforcing rod extending outward.

[0015] Advantages of this utility model: (1) This utility model, through its unique structural design of "fixed ladder sliding set in lifting ladder" and combined with multi-pin hole locking mechanism, realizes the rapid, stepless and reliable adjustment of the ladder height, so that the ladder can accurately follow the construction progress and adjust synchronously, solving the safety blind spot and low efficiency problem caused by the height mismatch of traditional fixed ladder. At the same time, the flexible adjustability of the height makes this ladder widely applicable to various construction terrains of different depths such as foundation pits and slopes of different heights. It has strong versatility, and a single set of equipment can meet diverse construction needs.

[0016] (2) The adjustable support mechanism of this utility model effectively solves the technical problem that the central support of the telescopic ladder is weak and easy to shake and bend when it is fully extended. Moreover, the mechanism can adapt to complex uneven ground, provide stable central support, and has strong load-bearing capacity and anti-deformation ability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Another perspective structural diagram; Figure 3 This utility model Figure 1 Schematic diagram of the fixed ladder in the middle; Figure 4 This utility model Figure 1 A schematic diagram of the structure of the medium-sized elevator; Figure 5 This is a schematic diagram of the support mechanism of this utility model; Figure 6 This is a schematic diagram of the structure of the safety ladder of this utility model after folding. Figure 7 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0019] In the diagram: 1. Fixed ladder; 101. First ladder beam; 102. First step; 2. Lifting ladder; 201. Second ladder beam; 202. Second step; 203. Limiting plate; 3. First pin hole; 4. Second pin hole; 5. Perforated pin; 6. Sleeve; 7. Support rod; 8. Adjusting screw; 9. Threaded sleeve; 10. Support pad; 11. Operating lever; 12. Angle compensation rod; 13. Safety railing; 14. Roller; 15. Fixed shaft; 16. Reinforcing rod. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: An adjustable-height construction safety ladder, such as... Figure 1-7 As shown, it includes a fixed ladder 1 and a lifting ladder 2. The fixed ladder 1 is inclined to the ground and serves as the supporting base for the safety ladder. The lifting ladder 2 is slidably mounted on the fixed ladder 1, and the overall height of the safety ladder can be adjusted by the relative sliding of the two.

[0022] The fixed ladder 1 includes two fixed ladder beams 101 arranged parallel to each other on the left and right. Specifically, the fixed ladder beams 101 are hollow steel pipes with rectangular cross sections. While ensuring load-bearing strength, they reduce the overall weight. Multiple first steps 102 are fixedly arranged between the two fixed ladder beams 101 and are evenly distributed along their length.

[0023] The lifting ladder 2 includes two parallel lifting ladder beams 201 spaced apart. Specifically, the two lifting ladder beams 201 are T-shaped steels with opposite middle wing plates. The lifting ladder beams 201 form upper and lower wing grooves through the middle wing plates. Two fixed ladder beams 101 are slidably installed in the upper wing grooves of the lifting ladder beams 201. The bottom ends of the fixed ladder beams 101 protrude from the upper wing grooves. By traction, the lifting ladder beams 201 slide along the fixed ladder 1, which can change the overlap length of the fixed ladder 1 and the lifting ladder 2, thereby adjusting the total height of the safety ladder. This allows for synchronous adjustment with the construction progress and adaptability to different construction terrains. To prevent the fixed ladder 1 from detaching from the upper wing groove, a limiting plate 203 is fixedly installed above the bottom end of the lifting ladder beams 201. The fixed ladder beams 101 are slidably installed between the limiting plate 203 and the upper wing groove of the lifting ladder beams 201.

[0024] Multiple second steps 202 are fixedly installed between the lower wing grooves of the two lifting ladder beams 201, evenly distributed along their length. The first step 102 and the second step 202 are offset along the vertical direction of the safety ladder to avoid mutual interference between the two during the sliding of the lifting ladder beams 201.

[0025] Both the first step 102 and the second step 202 are made of hollow aluminum alloy profiles, further reducing the weight of the safety ladder itself. To ensure safety and comfort during operation, one side of the first step 102 and the second step 202 is provided with a flat step surface. When the ladder is set up at the optimal inclination angle of 60°, the step surface of the first step 102 and the second step 202 can remain parallel to the horizontal plane, providing a stable support platform for construction workers. The step surface of the first step 102 and the second step 202 is provided with anti-slip protrusions. These anti-slip protrusions are integrally formed by cutting and protruding outwards, which can increase the friction of the soles of the feet and reduce the risk of slipping during the climbing process.

[0026] To lock and fix the adjusted fixed ladder 1 and the lifting ladder 2, a locking structure is provided between the fixed ladder 1 and the lifting ladder 2. Specifically, the locking structure includes multiple first pin holes 3 that are spaced apart along their extension direction and are open to the left and right on the first ladder beam 101, and multiple second pin holes 4 that are spaced apart along their extension direction and are open to the left and right on the second ladder beam 201. When the height is adjusted to the correct position, the multiple first pin holes 3 can correspond one-to-one with the multiple second pin holes 4. A perforated pin 5 is inserted into the lowermost second pin hole 4 and its corresponding first pin hole 3. The perforated pin 5 is a high-strength galvanized steel pin, which is fixed by pin screws to achieve a rigid fixed connection between the fixed ladder 1 and the lifting ladder 2.

[0027] When the second through hole 4 corresponds to the first through hole 3, the tread surfaces of the adjacent first step 102 and second step 202 are at the same horizontal height, forming a continuous and regular staircase between the fixed ladder 1 and the elevator 2, thus avoiding the inconvenience of walking caused by misalignment.

[0028] To enhance the structural stability of the adjustable-height construction safety ladder when fully extended and prevent bending or swaying due to increased span, an adjustable support mechanism is provided at the bottom of the ladder 2. This mechanism provides intermediate support for the safety ladder, matches different extension heights, and adapts to complex construction site terrain. Specifically, the support mechanism includes a support rod 7. The top of the support rod 7 is hinged to the bottom of the ladder 2 via a rotating connector. The rotating connector includes a fixed shaft 15, which is laterally fixed to the bottom of the lower wing groove of the ladder beam 201. A rotatable sleeve 6 is fitted in the middle of the fixed shaft 15, and the top of the support rod 7 is fixedly connected to the sleeve 6. Through this hinged arrangement, the support rod 7 can swing freely around the fixed shaft 15 within a certain fan-shaped area, thereby adaptively adjusting its support angle according to different ground slopes to ensure that its bottom can fully contact various complex terrains.

[0029] To achieve precise adjustment of the support length, the support rod 7 adopts a hollow steel tube structure. The top of the adjusting screw 8 is inserted into the cavity at the bottom of the support rod 7. A threaded sleeve 9 is threaded onto the adjusting screw 8. When the threaded sleeve 9 is tightened so that its top abuts against the bottom of the support rod 7, the relative position of the adjusting screw 8 and the support rod 7 can be locked by friction, forming a rigid support. To facilitate the rotation of the threaded sleeve 9, an operating lever 11 is fixedly provided on the threaded sleeve 9. By rotating the operating lever 11, the threaded sleeve 9 can be driven to screw in or out on the adjusting screw 8, thereby changing the length of the adjusting screw 8 extending out of the support rod 7, and finally realizing the adjustment of the overall support length of the support rod 7.

[0030] A support plate 10 is fixedly provided at the bottom end of the adjusting screw 8. The support plate 10 increases the contact area with the ground. On the one hand, it can prevent the end of the adjusting screw 8 from sinking into the soft ground due to excessive pressure. On the other hand, it can also provide greater friction, effectively preventing the support mechanism from sliding and ensuring the reliability of the support.

[0031] To achieve synchronous folding and storage of the support mechanism and the main body of the ladder, an angle compensation rod 12 is fixed between the sleeve 6 and the support rod 7. The angle compensation rod 12 and the support rod 7 are set perpendicular to each other to ensure that when folding, the support rod 7 can rotate to a position that is offset from the main body of the safety ladder in the vertical direction, so that it can be compactly folded under the safety ladder and fixed by simple means such as ropes.

[0032] To prevent personnel from slipping and falling while working at heights, an upward-extending safety railing 13 is fixedly installed on the lifting beam 201 of the elevator 2 to protect the top of the ladder.

[0033] To facilitate overall movement, the two ends of the fixed shaft 15 pass through the lifting ladder beam 201 and are respectively equipped with rollers 14. The bottom of the rollers 14 is lower than the fixed ladder beam 101, so that when the ladder is laid flat at a small angle, the rollers 14 can support the ground, making it easy to drag and transport.

[0034] To enhance the stability of the bottom support of the fixed ladder 1, a reinforcing rod 16 extending outward is fixedly provided at the bottom of the first ladder beam 101 of the fixed ladder 1. The reinforcing rod 16 can increase the base area between the bottom of the first ladder beam 101 and the ground, effectively preventing the fixed ladder 1 from sliding and ensuring the reliability of the support.

[0035] Working principle: When adjusting the height of the safety ladder, by applying traction force, the lifting ladder 2 slides along the fixed ladder 1, which serves as a guide rail. The rectangular ladder beam of the fixed ladder 1 moves smoothly in the upper wing groove of the T-shaped steel of the lifting ladder 2, changing the overlap length between the two to adjust the total height of the ladder. After adjusting to the target height, the two are rigidly fixed by inserting the perforated pin 5 in the locking structure into the aligned first pin hole 3 and second pin hole 4 to prevent accidental retraction.

[0036] When supporting the safety ladder, the length of the support rod 7 can be adjusted by rotating the operating lever 11 to drive the threaded sleeve 9, so that the support pad 10 at the bottom of the support rod 7 can be firmly in contact with the ground. At the same time, the hinged design at the top of the support rod 7 allows it to adapt to the ground slope, ensuring effective support in any terrain, transforming the ladder from a cantilever structure into a more stable simply supported structure, and greatly enhancing the overall rigidity.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An adjustable-height construction safety ladder, characterized in that: It includes a fixed ladder (1) and a lifting ladder (2). The fixed ladder (1) is set at an angle to the ground to serve as the supporting base for the safety ladder. The lifting ladder (2) is slidably mounted on the fixed ladder (1). The overall height of the safety ladder can be adjusted by the relative sliding of the two. A locking structure is provided between the fixed ladder (1) and the lifting ladder (2) to lock and fix the fixed ladder (1) and the lifting ladder (2) after the height is adjusted.

2. The adjustable-height construction safety ladder according to claim 1, characterized in that: The fixed ladder (1) includes two fixed ladder beams (101) arranged parallel to each other on the left and right, and a plurality of first steps (102) evenly distributed along the length direction are fixed between the two fixed ladder beams (101). The elevator (2) includes two elevator beams (201) arranged parallel to each other on the left and right. The two elevator beams (201) are T-shaped steels arranged opposite to each other with middle wing plates. The elevator beams (201) form upper wing grooves and lower wing grooves through the middle wing plates. The two fixed elevator beams (101) are slidably arranged in the upper wing grooves of the elevator beams (201). A limiting plate (203) is fixedly provided above the bottom end of the lifting ladder beam (201), and the fixed ladder beam (101) is slidably disposed between the limiting plate (203) and the upper wing groove of the lifting ladder beam (201).

3. The adjustable-height construction safety ladder according to claim 2, characterized in that: The locking structure includes multiple first pin holes (3) that are spaced apart along the extension direction and open to the left and right on the fixed ladder beam (101), and multiple second pin holes (4) that are spaced apart along the extension direction and open to the left and right on the lifting ladder beam (201). The multiple first pin holes (3) can correspond one-to-one with the multiple second pin holes (4). The second pin hole (4) at the bottom has a perforated pin (5) inserted into its corresponding first pin hole (3).

4. The adjustable-height construction safety ladder according to claim 2, characterized in that: Multiple second steps (202) are fixedly provided between the lower wing grooves of the two lifting ladder beams (201) and are evenly distributed along their length direction. The first step (102) and the second step (202) are offset from each other along the vertical direction of the safety ladder. The first pedal (102) and the second pedal (202) have a flat tread surface on one side, and when they are set up at a 60° angle, the tread surface is parallel to the horizontal plane.

5. The adjustable-height construction safety ladder according to claim 2, characterized in that: An adjustable support mechanism is provided at the bottom of the elevator (2). The support mechanism includes a support rod (7). The top of the support rod (7) is hinged to the bottom of the elevator (2) through a rotating connector to achieve angle adjustment. The support rod (7) adopts a hollow steel pipe structure. The top of the adjusting screw (8) is inserted into the cavity at the bottom of the support rod (7). A threaded sleeve (9) is threaded on the adjusting screw (8). The top of the threaded sleeve (9) rests against the bottom of the support rod (7). An operating lever (11) is fixed on the threaded sleeve (9).

6. The adjustable-height construction safety ladder according to claim 5, characterized in that: The rotating connector includes a fixed shaft (15), which is laterally fixed to the bottom end of the lower wing groove of the lifting beam (201). A rotatable sleeve (6) is sleeved in the middle of the fixed shaft (15), and the top end of the support rod (7) is fixedly connected to the sleeve (6). An angle compensation rod (12) is fixed between the sleeve (6) and the support rod (7), and the angle compensation rod (12) and the support rod (7) are perpendicular to each other.

7. The adjustable-height construction safety ladder according to claim 5, characterized in that: A support pad (10) is fixedly provided at the bottom end of the adjusting screw (8).

8. The adjustable-height construction safety ladder according to claim 2, characterized in that: The two ends of the fixed shaft (15) pass through the lifting ladder beam (201) and are respectively equipped with rollers (14). The bottom of the rollers (14) is lower than the fixed ladder beam (101).

9. The adjustable-height construction safety ladder according to claim 2, characterized in that: A safety guardrail (13) extending upward is fixedly installed on the lifting beam (201).

10. The adjustable-height construction safety ladder according to claim 2, characterized in that: The bottom end of the fixed ladder beam (101) of the fixed ladder (1) is fixed with a reinforcing rod (16) extending outward.

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