L-shaped step stair reinforcing method

Abstract

The invention discloses an L-shaped step stair reinforcing method which comprises step stiffening plates, step changing platform steel beams, stair plate steel beams, supporting angle steel and steel beam connecting plates. The step stiffening plate is tightly attached to the L-shaped step stair bottom plate; the step-changing platform steel beam is formed by welding a step-changing platform transverse steel beam, a step-changing platform longitudinal steel beam and a connecting steel beam, and is arranged at the bottom of the stair step-changing platform; the supporting angle steel is composed of short angle steel and long angle steel, and the stiffening plate is replaced when the step width and the step height of each step of the L-shaped step stair flight plate are inconsistent. The concrete beam connecting plate is used for connecting and fixing the step-changing platform steel beam and the stair plate steel beam when the step-changing platform bottom plate is provided with the concrete beam, and the construction method for lateral overturning reinforcement of the indoor L-shaped step stair of the old existing building is provided and is safe, reliable and convenient to construct.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and particularly relates to a method for reinforcing an L-shaped step staircase. Background Art

[0002] In recent years, more and more attention has been paid to creating better communities, and renovation of old communities has gradually become an important task in urban construction. The construction of old buildings has gradually changed from demolition to structural reinforcement. Stairs are the most frequently used parts of building structures and are also the most urgent parts in need of reinforcement.

[0003] Among them, L-shaped step stairs are mostly common in old residential buildings. After several years of use, the outer side of the L-shaped step stairs will overturn downward, and eventually evolve into lateral displacement and fracture of the stair section, causing irreversible consequences. Summary of the invention

[0004] In order to overcome the technical problem in the prior art that the outer side of an L-shaped step staircase may tip over after long-term use, the present invention provides a method for reinforcing an L-shaped step staircase to solve the above technical problem.

[0005] The L-shaped step stair reinforcement structure includes a stair slab steel beam, a step-changing platform steel beam, a step stiffening plate, a supporting angle steel and a steel beam connecting plate. The step stiffening plate is bent close to the bottom of the stair slab and welded to the stair slab steel beam. The step-changing platform steel beam is arranged at the bottom of the step-changing platform. The step-changing platform steel beam is composed of a step-changing platform transverse steel beam, a step-changing platform longitudinal steel beam and a connecting steel beam. The step-changing platform longitudinal steel beam extends into prefabricated holes in the walls on both sides, and a concrete prefabricated pad is arranged at the bottom. The connecting steel beams of the stair slab steel beam and the step-changing platform steel beam are welded and fixed. The supporting angle steel is composed of a long angle steel and a short angle steel. When the step width and step height of each step of the L-shaped step staircase are inconsistent, the step stiffening plate is replaced for use. When there is a concrete beam on the bottom plate of the step-changing platform, the steel beam connecting plate is connected and fixed to the stair slab steel beam and the step-changing platform steel beam by a connecting plate through through bolts;

[0006] The L-shaped stair reinforcement method includes the following steps:

[0007] S1: According to the construction design drawings and actual dimensions on site, make stair slab steel beams, step stiffening plates, step-changing platform transverse steel beams, step-changing platform longitudinal steel beams, connecting steel beams and prefabricated concrete pads;

[0008] S2: According to the construction drawings, draw lines at corresponding positions to drill prefabricated holes on the wall of the longitudinal steel beam of the step-changing platform;

[0009] S3: Grind and repair the connection surface between the steel beam and the step-changing platform to make it smooth. After the steel beam of the step-changing platform is placed in the prefabricated hole, it is filled with C30 micro-expanded fine stone concrete. Structural adhesive is used to fill the gap between the top of the steel beam of the step-changing platform and the step-changing platform.

[0010] S4: Grind the step bottom plate and select step stiffeners or support angle steels according to the site conditions;

[0011] S5: The step stiffener is pressed against the stair step bottom plate bend, with the width being the same as the stair section width. The step stiffener is fixed to the stair step by structural adhesive, and the step stiffener is welded to the stair plate steel beam at the bend. When the step height and step width of each step of the L-shaped stair are inconsistent, the support angle steel is used to replace the step stiffener. The construction sequence is to first weld the stair plate steel beam to the connecting steel beam, and then make and install the support angle steel on site according to the distance between the stair plates and the stair plate steel beams. The long side of the short angle steel is close to the stair bottom plate, and the short side is close to the stair side plate. It is fixed by structural adhesive, and the support angle steel is welded to the stair plate steel beam;

[0012] S6: Weld the stair slab steel beam to the connecting steel beam;

[0013] S7: When there is a concrete beam on the bottom plate of the step-changing platform, the connection method between the stair slab steel beam and the step-changing platform steel beam is changed to through-bolt connection. Confirm the drilling position according to the construction design drawing, reserve the through-bolt connection port, weld the steel beam connection plate to the stair slab steel beam and the end of the step-changing platform transverse steel beam, and install the through-bolts to connect the stair slab steel beam and the step-changing platform steel beam into a whole;

[0014] S8: Restore the wall surface flatness and surface coating.

[0015] In the above-mentioned L-shaped step stair reinforcement method, the steel plate thickness of the step stiffening plate is not less than 5 mm, the connection surface between the step stiffening plate and the stair bottom plate is subjected to interface treatment, and the gap between the step stiffening plate and the stair bottom plate is filled with structural adhesive.

[0016] The above-mentioned L-shaped step stair reinforcement method, the stair plate steel beam, the step change platform transverse steel beam, and the step change platform longitudinal steel beam have dimensions of 200mm×100mm×5.5mm×8mm, the connecting steel beam has dimensions of 250mm×125mm×6mm×9mm, the steel material used is Q355B, and the thickness of the supporting angle steel and the connecting plate is not less than 5mm.

[0017] The above-mentioned L-shaped step stair reinforcement method, the reserved hole has a lateral depth of not less than 200mm, a width of not less than 200mm, a height of not less than 260mm, the thickness of the bottom prefabricated concrete pad is 60mm, the top of the step-changing platform steel beam is close to the bottom plate of the step-changing platform, and the gap between the bottom plate is filled with structural adhesive, the transverse steel beam of the step-changing platform and the longitudinal steel beam of the step-changing platform are connected by welding, and the longitudinal steel beam of the step-changing platform is placed in the prefabricated hole in the wall and filled with C30 micro-expanded fine stone concrete.

[0018] In the above-mentioned L-shaped step stair reinforcement method, when there is a concrete beam at the bottom of the floor slab, the transverse steel beam of the step-changing platform and the steel beam of the stair slab are fixedly connected by through-bolts.

[0019] In the above-mentioned L-shaped step stair reinforcement method, the size of the steel beam connecting plate is 200mm×100mm, and the diameter of the through bolt is 16mm.

[0020] In the above-mentioned L-shaped step stair reinforcement method, when the step height and step width of each step of the L-shaped step stair are inconsistent, the supporting angle steel used is composed of long angle steel and short angle steel, the long angle steel is an equal-leg angle steel with a size of 75mm×75mm×5mm, and the short angle steel is an unequal-leg angle steel with a size of 80mm×50mm×5mm.

[0021] In the above-mentioned L-shaped step stair reinforcement method, the short angle steel is connected to the step bottom plate by structural adhesive, one leg of the long angle steel is welded to the web of the stair slab steel beam on the same surface, and the long angle steel is welded to the short angle steel.

[0022] In general, compared with the prior art, the above technical scheme conceived by the present invention can achieve the following beneficial effects: the present invention provides an L-shaped step stair reinforcement method, which is convenient and simple to construct, minimizes the impact on the daily life of residents in the building during the construction process, has a safe and reliable structure, and solves the problem of the outer side of the L-shaped step staircase tipping over. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of an L-shaped step stair reinforcement structure of the present invention;

[0025] Figure 2 Reinforcement plan for L-shaped staircases in old buildings;

[0026] Figure 3 This is a schematic diagram of the reinforcement structure of the steel beam of the step-changing platform;

[0027] Figure 4 Plan for reinforcing the L-shaped staircase in an old building (concrete beams exist on the step-changing platform);

[0028] Figure 5 This is a schematic diagram of the reinforcement of the L-shaped staircase in an old building (when the step width and step height of each step are inconsistent);

[0029] In the figure: 1-stair plate steel beam, 2-step change platform steel beam, 3-step stiffening plate, 4-transverse steel beam of step change platform, 5-longitudinal steel beam of step change platform, 7-connecting steel beam, 8-support angle steel, 9-long angle steel, 10-short angle steel, 11-precast hole, 12-precast concrete pad, 13-steel beam connecting plate, 14-through bolt, 15-structural adhesive. DETAILED DESCRIPTION

[0030] like Figure 1 and Figure 2 As shown, it is an overall structural schematic diagram and plan view of an L-shaped step stair reinforcement method of the present invention, including a stair slab steel beam 1, a step-changing platform steel beam 2, a step stiffening plate 3, a support angle steel 8 and a steel beam connecting plate 13. The step stiffening plate 3 is bent close to the bottom of the stair slab and welded to the stair slab steel beam 1. The step-changing platform steel beam 2 is arranged at the bottom of the step-changing platform. The step-changing platform steel beam is composed of a step-changing platform transverse steel beam 4, a step-changing platform longitudinal steel beam 5 and a connecting steel beam 7. The step-changing platform longitudinal steel beam 5 extends into prefabricated holes 11 on both sides of the wall, and a prefabricated concrete pad 12 is arranged at the bottom. The stair slab steel beam 1 and the connecting steel beam 7 of the step-changing platform steel beam 2 are welded and fixed. The support angle steel 8 is composed of a long angle steel 9 and a short angle steel 10. Figure 3 As shown, it is a schematic diagram of the structure of the reinforcement of the steel beam 2 of the step-changing platform.

[0031] The steel plate thickness of the step stiffening plate 3 is not less than 5 mm, the connection surface between the step stiffening plate 3 and the stair bottom plate is subjected to interface treatment, and the gap between the step stiffening plate 3 and the stair bottom plate is filled with structural adhesive 15.

[0032] The dimensions of stair slab steel beam 1, step-changing platform transverse steel beam 4, and step-changing platform longitudinal steel beam 5 are 200mm×100mm×5.5mm×8mm, and the dimensions of connecting steel beam 7 are 250mm×125mm×6mm×9mm. The steel materials used are Q355B, and the thickness of supporting angle steel and connecting plate shall not be less than 5mm.

[0033] The reserved hole 11 has a horizontal depth of not less than 200mm, a width of not less than 200mm, and a height of not less than 260mm. The thickness of the bottom concrete prefabricated pad 12 is 60mm. The top of the step-changing platform steel beam 2 is close to the step-changing platform bottom plate, and the gap between the bottom plate is filled with structural adhesive 15. The step-changing platform horizontal steel beam 4 is connected to the step-changing platform longitudinal steel beam 5 by welding. The step-changing platform longitudinal steel beam 5 is placed in the wall prefabricated hole 11 and filled with C30 micro-expanded fine stone concrete. The steel beam connecting plate 13 has a size of 200mm×100mm, and the diameter of the through bolt 14 is 16mm.

[0034] When there is a concrete beam at the bottom of the floor, the horizontal steel beam 4 of the step-changing platform is fixedly connected with the steel beam 1 of the stair slab by through-bolts 14, such as Figure 4 shown.

[0035] When the step width and step height of each step of the L-shaped staircase are inconsistent, the step stiffening plate 3 is replaced and used. When there is a concrete beam on the bottom plate of the step-changing platform, the steel beam connecting plate 13 is used to connect and fix the stair plate steel beam 1 with the step-changing platform steel beam 2 through the through bolts 14, such as Figure 5 shown.

[0036] The supporting angle steel 8 is composed of a long angle steel 9 and a short angle steel 10. The long angle steel 9 is an equal angle steel with a size of 75mm×75mm×5mm, and the short angle steel 10 is an unequal angle steel with a size of 80mm×50mm×5mm. The short angle steel 10 is connected to the step bottom plate with a structural adhesive 15. One limb of the long angle steel 9 is welded to the web of the stair slab steel beam 1 on the same surface, and the long angle steel 9 is welded to the short angle steel 10.

[0037] The L-shaped stair reinforcement method includes the following steps:

[0038] Step 1: According to the construction design drawings and the actual dimensions on site, make the stair slab steel beam 1, the step stiffening plate 3, the step-changing platform transverse steel beam 4, the step-changing platform longitudinal steel beam 5, the connecting steel beam 7 and the concrete prefabricated pad 12;

[0039] Step 2: According to the construction drawings, draw lines at corresponding positions to drill prefabricated holes 11 on the wall of the longitudinal steel beam 5 of the step-changing platform;

[0040] Step 3: Grind and repair the connection surface between the steel beam and the step-changing platform to make it smooth, put the step-changing platform steel beam 2 into the prefabricated hole 11 and fill it with C30 micro-expanded fine stone concrete, and fill the gap between the top of the step-changing platform steel beam 2 and the step-changing platform with structural adhesive 15;

[0041] Step 4: Grind the step bottom plate and select the step stiffening plate 3 or the supporting angle steel 8 according to the site conditions;

[0042] Step 5: The step stiffening plate 3 is pressed against the stair step bottom plate and bent, and its width is the same as the stair section width. The step stiffening plate 3 is fixed to the stair step by structural adhesive 15, and the bending part of the step stiffening plate 3 is welded to the stair plate steel beam 3. When the step height and step width of each step of the L-shaped step stair are inconsistent, the support angle steel 8 is selected to replace the step stiffening plate 3. The construction sequence is to first weld the stair plate steel beam 1 to the connecting steel beam 7, and then make the support angle steel 8 on site according to the distance between the stair plate and the stair plate steel beam 1 and install it. The long side of the short angle steel 10 is close to the stair bottom plate, and the short side is close to the stair side plate. It is fixed by structural adhesive 15, and the support angle steel 8 is welded to the stair plate steel beam 1;

[0043] Step 6: Weld the stair slab steel beam 1 and the connecting steel beam 7;

[0044] Step 7: When there is a concrete beam on the bottom plate of the step-changing platform, the connection mode between the stair slab steel beam 1 and the step-changing platform steel beam 2 is changed to through-bolt 14 connection. The drilling position is confirmed according to the construction design drawing, and the through-bolt 14 connection port is reserved. The steel beam connecting plate 13 is welded to the stair slab steel beam 1 and the end of the step-changing platform transverse steel beam 4, and the through-bolt 14 is installed to connect the stair slab steel beam 1 and the step-changing platform steel beam 2 as a whole;

[0045] Step 8: Restore the wall flatness and surface paint.

Claims

1. A method for reinforcing an L-shaped staircase, characterized in that: The L-shaped step stair reinforcement structure comprises a stair slab steel beam (1), a step-changing platform steel beam (2), a step stiffening plate (3), a supporting angle steel (8) and a steel beam connecting plate (13), wherein the step stiffening plate (3) is bent closely against the bottom of the stair slab and welded to the stair slab steel beam (1), the step-changing platform steel beam (2) is arranged at the bottom of the step-changing platform, and the step-changing platform steel beam is composed of a step-changing platform transverse steel beam (4), a step-changing platform longitudinal steel beam (5) and a connecting steel beam (7), and the step-changing platform longitudinal steel beam (5) extends into the prefabricated holes (11) of the walls on both sides. 1), a prefabricated concrete pad (12) is provided at the bottom, the stair slab steel beam (1) and the connecting steel beam (7) of the step-changing platform steel beam (2) are welded and fixed, the supporting angle steel (8) is composed of a long angle steel (9) and a short angle steel (10), and is used to replace the step stiffening plate (3) when the step width and step height of each step of the L-shaped step staircase are inconsistent, and the steel beam connecting plate (13) is used to connect and fix the stair slab steel beam (1) and the step-changing platform steel beam (2) by means of the connecting plate through the through bolts (14) when there is a concrete beam on the bottom plate of the step-changing platform; The L-shaped stair reinforcement method includes the following steps: S1: According to the construction design drawings and the actual dimensions on site, stair slab steel beams (1), step stiffening plates (3), step-changing platform transverse steel beams (4), step-changing platform longitudinal steel beams (5), connecting steel beams (7) and prefabricated concrete pads (12) are manufactured; S2: According to the construction drawings, a prefabricated hole (11) is drilled on the wall of the longitudinal steel beam (5) of the step-changing platform at a corresponding position; S3: The connection surface between the steel beam and the step-changing platform is polished and repaired to be smooth, the step-changing platform steel beam (2) is placed in the prefabricated hole (11) and then filled with C30 micro-expanded fine stone concrete, and the gap between the top of the step-changing platform steel beam (2) and the step-changing platform is filled with structural adhesive (15); S4: Grind the step bottom plate and select a step stiffening plate (3) or a supporting angle steel (8) according to the site conditions; S5: The step stiffening plate (3) is pressed against the stair step bottom plate and bent, and its width is the same as the stair section width. The step stiffening plate (3) is fixed to the stair step by means of structural adhesive (15). The bending part of the step stiffening plate (3) is welded to the stair slab steel beam (3). When the step height and step width of each step of the L-shaped stair are inconsistent, a support angle steel (8) is selected to replace the step stiffening plate (3). The construction sequence is to first weld the stair slab steel beam (1) to the connecting steel beam (7), and then manufacture and install the support angle steel (8) on site according to the distance between the stair slab and the stair slab steel beam (1). The long side of the short angle steel (10) is close to the stair bottom plate, and the short side is close to the stair side plate. The short angle steel (10) is fixed by means of structural adhesive (15), and the support angle steel (8) is welded to the stair slab steel beam (1); S6: welding the stair slab steel beam (1) and the connecting steel beam (7); S7: When there is a concrete beam on the bottom plate of the step-changing platform, the connection method between the stair slab steel beam (1) and the step-changing platform steel beam (2) is changed to a through-bolt (14) connection. The drilling position is confirmed according to the construction design drawing, and a connection port for the through-bolt (14) is reserved. The steel beam connecting plate (13) is welded to the end of the stair slab steel beam (1) and the transverse steel beam (4) of the step-changing platform, and the through-bolt (14) is installed to connect the stair slab steel beam (1) and the step-changing platform steel beam (2) into a whole. S8: Restore the wall surface flatness and surface coating.

2. The L-shaped step stair reinforcement method according to claim 1, characterized in that: The steel plate thickness of the step stiffening plate (3) is not less than 5 mm, the connection surface between the step stiffening plate (3) and the stair bottom plate is subjected to interface treatment, and the gap between the step stiffening plate (3) and the stair bottom plate is filled with structural adhesive (15).

3. The L-shaped step stair reinforcement method according to claim 1, characterized in that: The dimensions of the stair slab steel beam (1), the step-changing platform transverse steel beam (4), and the step-changing platform longitudinal steel beam (5) are 200mm×100mm×5.5mm×8mm, and the dimensions of the connecting steel beam (7) are 250mm×125mm×6mm×9mm. The steel material used is Q355B, and the thickness of the supporting angle steel and the connecting plate is not less than 5mm.

4. The L-shaped step stair reinforcement method according to claim 1, characterized in that: The reserved hole (11) has a transverse depth of not less than 200 mm, a width of not less than 200 mm, and a height of not less than 260 mm. The thickness of the bottom prefabricated concrete pad (12) is 60 mm. The top of the step-changing platform steel beam (2) is tightly attached to the bottom plate of the step-changing platform, and the gap between the top and the bottom plate is filled with structural adhesive (15). The transverse steel beam (4) of the step-changing platform is connected to the longitudinal steel beam (5) of the step-changing platform by welding. After the longitudinal steel beam (5) of the step-changing platform is placed in the prefabricated hole (11) on the wall, it is filled with C30 micro-expanded fine stone concrete.

5. The L-shaped step stair reinforcement method according to claim 1, characterized in that: When there is a concrete beam at the bottom of the floor slab, the step-changing platform transverse steel beam (4) and the stair slab steel beam (1) are fixedly connected by through-bolts.

6. The L-shaped step stair reinforcement method according to claim 1, characterized in that: The steel beam connecting plate (13) has a size of 200 mm×100 mm, and the through bolt (14) has a diameter of 16 mm.

7. The L-shaped step stair reinforcement method according to claim 1, characterized in that: When the step height and step width of each step of the L-shaped step staircase are inconsistent, the supporting angle steel (8) used is composed of a long angle steel (9) and a short angle steel (10), wherein the long angle steel (9) is an equal-leg angle steel with a size of 75mm×75mm×5mm, and the short angle steel (10) is an unequal-leg angle steel with a size of 80mm×50mm×5mm.

8. The L-shaped step stair reinforcement method according to claim 1, characterized in that: The short angle steel (10) is connected to the step bottom plate by using structural adhesive (15), one leg of the long angle steel (9) is welded to the web of the stair slab steel beam (1) on the same surface, and the long angle steel (9) is welded to the short angle steel (10).

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