Fabricated steel ladder design structure

Abstract

The utility model discloses a kind of fabricated steel ladder design structure, including ladder column unit, ladder beam unit, grating step unit, platform unit and railing unit;The lowermost group of ladder beam lower end is anchored to ground, and upper end bolt connection is to platform unit, and the both ends of remaining group of ladder beam are bolted to the two platforms corresponding to upper and lower respectively;Ladder column unit includes the ladder column of multiple groups of different heights corresponding to the height of platform, grating step unit includes multiple grating steps, and its both sides are bolted to ladder beam respectively;Railing unit includes oblique railing bolted to ladder beam and positive railing bolted to platform.The utility model solves the following technical problems: one, steel ladder can be quickly installed;Two, reduce the demand of steel ladder installation to site space, and can be completed with high accuracy;Three, steel ladder needs standardization manufacturing, convenient disassembly, improve resource recycling rate;Four, realize the assembly type operation of full bolt without welding operation.

Description

Technical Field

[0001] This utility model relates to the field of building steel structure technology. More specifically, this utility model relates to a prefabricated steel ladder design structure. Background Technology

[0002] Steel staircases are widely used in various types of buildings, not only because they are safe and durable and save space, but also because they can meet the needs of various architectural designs. Steel staircases are mainly composed of components such as columns, beams, steps, platforms, and railings. Since the design must meet architectural requirements and the spatial placement of components is relatively complex, the current common practice is to fabricate them in a factory and then install them after the main structural frame is completed.

[0003] Existing technologies include: using embedded parts to form rigid joints at the base of stair columns; welding stair beams and treads in the factory before overall installation on site; and welding platform panels and treads at connection points on site. However, these technologies have the following drawbacks in practical applications:

[0004] (1) Embedded parts are pre-embedded before concrete pouring; ladder beams, treads and platforms are hoisted after the steel frame is installed; railings and handrails are installed during the interior decoration stage. The whole process is fragmented and there are significant safety hazards.

[0005] (2) The steel ladders are heavy, inconvenient to transport, and have limited on-site installation space, resulting in poor installation accuracy.

[0006] (3) The ladder beams and treads are fully welded together, and can only be dismantled during resource recycling, making them unrecyclable.

[0007] (4) The on-site welding space is small, the amount of railing welding is large and the platform plate is thin, so the welding quality cannot be guaranteed.

[0008] In view of the shortcomings of typical steel ladders, such as low precision in manufacturing and installation, high cost and low resource recycling rate due to the large amount of welding and limited on-site installation space, this application is applicable to the design, manufacturing and installation of steel ladders in the field of building steel structures, and aims to solve these shortcomings. Utility Model Content

[0009] One objective of this utility model is to provide a prefabricated steel ladder design structure that solves the following technical problems: 1. The steel ladder can be installed quickly; 2. The installation of the steel ladder reduces the space requirements on site and can be completed with high precision; 3. The steel ladder needs to be manufactured in a standardized manner, which facilitates disassembly and improves the resource recycling rate; 4. There is no welding operation, realizing a fully bolted assembly operation.

[0010] To address the aforementioned technical problems, this utility model provides a prefabricated steel ladder design structure, comprising multiple prefabricated units: a ladder column unit, a ladder beam unit, a grid step unit, a platform unit, and a railing unit. The ladder beam unit includes multiple sets of ladder beams, each set comprising a pair of opposing ladder beams. The lowermost set of ladder beams is anchored to the ground concrete at its lower end, and bolted to the platform crossbeam of the platform unit at its upper end. The remaining sets of ladder beams are bolted to the corresponding upper and lower platform crossbeams at both ends. The platform unit includes multiple platforms for bolting to the corresponding ladder beams. The ladder column unit includes multiple sets of ladder columns of different heights, arranged according to the platform height. Each set of ladder columns includes multiple columns, the lower end of which is anchored to the ground concrete, and the upper end bolted to the corresponding platform. The grid step unit includes multiple grid steps, evenly spaced between each set of ladder beams, with both sides of each grid step bolted to the ladder beam. The railing unit includes diagonal railings bolted to the ladder beams and straight railings bolted to the platform.

[0011] Preferably, the lower end of the bottom set of ladder beams is provided with facing angle steel and extends into the groove formed in the ground. The lower end of the bottom set of ladder beams is anchored in the groove by facing angle steel bolts, and the groove is filled with concrete to cover it.

[0012] Preferably, the lower end of the stair column is provided with a column base plate, which is anchored to the ground concrete by anchor bolts, chemical anchors or expansion bolts.

[0013] Preferably, each grating step is a prefabricated integral component, and an integrally formed L-shaped patterned steel plate is welded to the front end of the grating step as a front guard plate; connecting plates are provided on both sides of the grating step, and round holes and elongated holes are provided on them. The grating step is bolted to the ladder beams on both sides through the round holes and elongated holes on the connecting plates.

[0014] Preferably, both the diagonal and straight railings have base plates fixedly installed at their bottoms, which are connected to the ladder beams and platform crossbeams by bolts.

[0015] Preferably, a protective component is provided at the connection between the diagonal railing and the straight railing, which includes a pair of elastic clips and a pair of fixing plates. The elastic clips are arc-shaped and their inner diameter is smaller than the outer diameter of the railing. The pair of elastic clips are respectively sleeved on the uppermost and lowermost railings at the connection between the ends of the diagonal railing and the straight railing. The openings of the pair of elastic clips are connected as one unit by a pair of fixing plate bolts on the same side.

[0016] This utility model has at least the following beneficial effects:

[0017] (1) The processing and manufacturing of this utility model is carried out by disassembling smaller units, making the components lighter and more standardized, and making the manufacturing and transportation more convenient.

[0018] (2) The present invention adopts a full bolt connection, which does not require much on-site installation space, and the bolt hole position can assist in the positioning and correction of the components, increasing the installation efficiency by more than two times and greatly improving the installation accuracy.

[0019] (3) This utility model reduces the amount of welding, which greatly reduces the construction costs of manufacturing, transportation and installation.

[0020] (4) Each unit of this utility model is made into a smaller unit and bolted together in sequence to form an integral structure. The installation and connection process is highly safe and does not require complex and unsafe procedures such as hoisting with large equipment.

[0021] (5) This utility model adopts a full bolt connection and is made by disassembling smaller units, which makes it convenient to recycle resources and has a high utilization rate, and is green and environmentally friendly.

[0022] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a detailed drawing of the starting node of the ladder beam according to this utility model;

[0025] Figure 3 This is a detailed drawing of the column base node of the ladder column of this utility model;

[0026] Figure 4 Detail of the grid step connection node of this utility model Figure 1 ;

[0027] Figure 5 Detail of the grid step connection node of this utility model Figure 2 ;

[0028] Figure 6 This is a detailed drawing of the slanted railing construction method of this utility model;

[0029] Figure 7 This is a detailed drawing of the front railing construction method of this utility model;

[0030] Figure 8 This is a schematic diagram of the structure of the railing connection point of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Stair column, 2. Stair beam, 3. Grille step, 4. Platform, 5. Diagonal railing, 6. Straight railing, 7. Angle steel, 8. Bolt, 9. Concrete, 10. Column base plate, 11. Front guard plate, 12. Long strip hole, 13. Round hole, 14. Connecting plate, 15. Pad plate, 16. Elastic clamp, 17. Fixing plate. Detailed Implementation

[0033] To better understand the purpose, structure, and function of this utility model, the following detailed description is provided in conjunction with the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0034] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0035] like Figures 1 to 8 As shown, this utility model provides a prefabricated steel ladder design structure, including multiple prefabricated units, namely, a ladder column unit, a ladder beam unit, a grid step unit, a platform unit, and a railing unit. The ladder beam unit includes multiple sets of ladder beams, each set including a pair of opposing ladder beams 2. The lowermost set of ladder beams is anchored in the ground concrete at its lower end and bolted to the platform crossbeam of the platform unit at its upper end. The two ends of the remaining sets of ladder beams are bolted to two corresponding horizontal beam platforms at the upper and lower ends, respectively. The platform unit includes multiple platforms 4, which are used to bolt to the corresponding ladder beams. The ladder column unit includes multiple sets of ladder columns of different heights, each set including multiple ladder columns 1. The lower ends of the ladder columns are anchored in the ground concrete and the upper ends are bolted to the corresponding platform. The grid step unit includes multiple grid steps 3, which are evenly spaced between each set of ladder beams. The two sides of the grid steps are bolted to the ladder beams, respectively. The railing unit includes diagonal railings 5 ​​bolted to the ladder beams and straight railings 6 bolted to the platform.

[0036] This application sets up prefabricated units according to component type, designs a column base node to realize the bolted connection between the stair column and the original concrete structure, designs a steel grating step to realize the bolted connection between the stair beam and the step, and designs a railing to realize the bolted connection between the railing and the stair beam, thus completing a fully bolted prefabricated steel staircase, which can effectively solve the problems existing in the prior art and save costs. Figure 1As shown, the steel ladder structure is divided into several small prefabricated units (ladder columns, ladder beams, steps, platforms, diagonal railings, and straight railings) according to the design drawings, and then all of them are assembled and connected by bolts in sequence.

[0037] In another technical solution, the lower end of the bottom set of ladder beams is provided with facing angle steel 7 and extends into the groove formed in the ground. The lower end of the bottom set of ladder beams is anchored in the groove by facing angle steel bolts 8, and concrete 9 is poured into the groove to cover it.

[0038] like Figure 2 As shown, a ladder beam starting node is designed, using L80*8 angle steel as a transition piece, and M12 expansion bolts or chemical anchors for fixing. After installation, C25 concrete is poured to ensure that the steel ladder can be tightly connected to the concrete structure and to provide corrosion protection.

[0039] In another technical solution, a column base plate 10 is provided at the lower end of the stair column, which is anchored to the ground concrete by bolts 8.

[0040] like Figure 3 As shown, a ladder column base node is designed. The column base plate and the ladder column are welded together in the processing plant, and bolt anchoring, including anchor bolts, chemical anchors or expansion bolts, is used on site for anchoring and fixing.

[0041] In another technical solution, each grating step is a prefabricated integral component, and an integrally formed L-shaped patterned steel plate is welded to the front end of the grating step as a front guard plate 11; a connecting plate 14 is provided on both sides of the grating step, which is provided with round holes and elongated holes, and the grating step is bolted to the ladder beams on both sides through the round holes 13 and elongated holes 12 on the connecting plate.

[0042] like Figure 4 and Figure 5 As shown, a steel grating-type stair tread is designed. The grating is welded from 8*8 twisted square steel and PL5*32 steel plate. A 3mm thick checkered steel plate is welded to the front edge of the tread as a protective plate, which serves to prevent bumps and slips. 5mm thick connecting plates are installed on both sides of the tread. For easy installation, a round hole and a long slotted hole are provided on the connecting plates to accommodate deviations during installation. The grating tread is a standard component, mass-produced in the factory and transported to the site for installation. If the stair tread is an L-shaped steel plate type, only the connecting plates on the left and right sides need to be changed.

[0043] In another technical solution, a pad 15 is fixedly installed at the bottom of both the diagonal railing and the straight railing, and is connected to the ladder beam and the platform crossbeam by bolts.

[0044] like Figure 6 and Figure 7As shown, the design includes both sloping and straight railings. The railing posts and handrails are made of D42*3.5 steel pipe, while the central crossbar is made of D32*3.5 steel pipe. Each post has a base plate at its bottom and is fixed to the ladder beam with two M12 bolts. Since the railings are divided into sloping and straight types, the base plates at the bottom of the posts are slightly different (the sloping railing uses a PL10*70*180 base plate, and the straight railing uses a PL8*70*120 base plate).

[0045] In another technical solution, a protective component is provided at the connection between the diagonal railing and the straight railing, which includes a pair of elastic clips 16 and a pair of fixing plates 17. The elastic clips are arc-shaped and their inner diameter is smaller than the outer diameter of the railing. The pair of elastic clips are respectively sleeved on the uppermost and lowermost railings at the connection between the ends of the diagonal railing and the straight railing. The same side of the opening of the pair of elastic clips is connected as a whole by a pair of fixing plate bolts.

[0046] like Figure 8 As shown, after installation, the ends of the diagonal and straight railings are basically aligned as one unit. This is to ensure a more stable overall structural connection and to form a unified railing, protecting the safety of people holding onto it. The elastic clips are circular structures with notches, forming an arc, which allows them to be engaged with the ends of the diagonal and straight railings. The elastic clips have a certain width, allowing both sides to overlap onto the ends of the diagonal and straight railings. A pair of elastic clips are flexible and have their openings facing each other. Then, a pair of fixing plates are used to bolt the pair of elastic clips together.

[0047] Based on the above technical solutions, this application can achieve a relatively complete detachable and fully bolted connection of steel ladders, creating significant benefits in terms of on-site installation, cost savings, and resource recycling. Existing technologies involve welding the ladder beams, steps, and platform plates together, fabricating them in a factory, and then transporting them to the site for installation. The platform plates or steps at the joints require on-site patch welding, and the railings are also welded to the ladder beams on-site. This results in high transportation costs, low installation efficiency due to space constraints, poor precision, unreliable welding quality, and low recyclability. This application fully considers the continuity and convenience of the fabrication, transportation, and installation of each steel ladder unit, designing bolted connection nodes for ladder column joints, steel grating steps and ladder beams, and railings and ladder beams. By assembling each steel ladder unit entirely with bolts, the efficiency and precision of on-site installation are greatly improved, and costs are significantly reduced. This fully bolted detachable steel ladder also achieves repeated resource utilization, making it more environmentally friendly.

[0048] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model, and other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A prefabricated steel ladder design structure, characterized in that, The system comprises multiple prefabricated units, namely, a stair column unit, a stair beam unit, a grid step unit, a platform unit, and a railing unit. The stair beam unit includes multiple sets of beams, each set consisting of a pair of opposing beams. The lowermost set of beams is anchored to the concrete floor, and its upper end is bolted to the platform unit. The remaining sets of beams are bolted to their respective upper and lower platforms. The platform unit includes multiple platforms for bolting to the corresponding stair beams. The stair column unit includes multiple sets of columns of varying heights, each set consisting of multiple columns anchored to the concrete floor and bolted to their upper ends on the corresponding platforms. The grid step unit includes multiple grid steps evenly spaced between each set of beams, with both sides of each step bolted to the beams. The railing unit includes diagonal railings bolted to the beams and straight railings bolted to the platforms.

2. The prefabricated steel ladder design structure as described in claim 1, characterized in that, The bottom set of ladder beams is fitted with facing angle steel at the lower end and extends into the groove formed in the ground. The bottom set of ladder beams is anchored in the groove by facing angle steel bolts, and concrete is poured into the groove to cover it.

3. The prefabricated steel ladder design structure as described in claim 1, characterized in that, The lower end of the ladder column is provided with a column base plate, which is anchored to the ground concrete by bolts.

4. The prefabricated steel ladder design structure as described in claim 1, characterized in that, Each grating step is a prefabricated integral component. The front end of the grating step is welded with an integrally formed L-shaped patterned steel plate as a front guard plate. Both sides of the grating step are provided with connecting plates, which are provided with round holes and elongated holes. The grating step is bolted to the ladder beams on both sides through the round holes and elongated holes on the connecting plates.

5. The prefabricated steel ladder design structure as described in claim 1, characterized in that, Both the diagonal and straight railings have fixed pads at their bottoms, which are connected to the ladder beams and platforms by bolts.

6. The prefabricated steel ladder design structure as described in claim 1, characterized in that, A protective component is provided at the connection between the diagonal railing and the straight railing, which includes a pair of elastic clips and a pair of fixing plates. The elastic clips are arc-shaped and their inner diameter is smaller than the outer diameter of the railing. The pair of elastic clips are respectively sleeved on the uppermost and lowermost railings at the connection between the ends of the diagonal railing and the straight railing. The same side of the opening of the pair of elastic clips is connected as a whole by a pair of fixing plates bolts.

Images