Construction method based on secondary fixing of aluminum formwork stair railing embedded part

Abstract

The invention relates to the technical field of embedded part construction, in particular to a construction method based on secondary fixing of an aluminum formwork stair railing embedded part. Comprising the following steps that technical disclosure is made for constructors before construction, required materials, tools and constructors are completely equipped, the specifications, positions, numbers and lengths of stair beam ribs, plate ribs and distribution ribs meet design requirements, and the position sidelines of the embedded parts are accurately given out according to a rail deepening map. According to the method, the advantage that the aluminum alloy formwork is good in forming impression is reserved, meanwhile, the accuracy of the installation position of the embedded part is improved, the specification, the model and the position of the embedded part are confirmed according to the rail deepening drawing before construction, fixing holes are reserved during embedded part production, meanwhile, the fixing holes are synchronously reserved in the corresponding positions during aluminum alloy formwork production, and the construction efficiency is improved. On the basis of preliminary fixing of the embedded part, the embedded part is secondarily fixed through the novel fixing device, the fixing nut is removed after concrete pouring is completed, removal of a building step formwork is not affected, and the purposes of quality improvement and efficiency improvement are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of embedded part construction, in particular to a construction method based on secondary fixing of embedded parts of aluminum mold stair railings. Background Art

[0002] Aluminum alloy formworks are increasingly used and have great advantages in terms of concrete molding quality, special-shaped molding quality, and turnover to reduce project costs. However, some locations where aluminum alloy formworks are used are not conducive to the installation of embedded parts.

[0003] Generally, when installing the aluminum formwork of traditional stairs, a cover plate is set on the top of the stair treads to fully enclose it. In this way, the position and elevation of the embedded parts of the stair railings must be accurate during installation. Unlike the traditional wooden formwork whose upper part is not enclosed and the embedded parts can be corrected in time during concrete pouring, the embedded parts of the stair railings in the aluminum alloy formwork system cannot be corrected during concrete pouring, which can easily lead to installation position deviations.

[0004] Based on this, the present invention provides a construction method based on secondary fixation of embedded parts of aluminum mold stair railings to solve the technical problems raised above. Summary of the invention

[0005] The purpose of the present invention is to provide a construction method based on secondary fixation of embedded parts of aluminum mold stair railings to solve the problems raised by the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A construction method for secondary fixing of embedded parts of aluminum mold stair railings is provided, comprising the following steps: S1. Provide technical explanations to construction personnel before construction, and ensure that all necessary materials, tools and construction personnel are fully equipped; S2. The specifications, positions, quantities and lengths of the stair beam reinforcement, plate reinforcement and distribution reinforcement shall meet the design requirements; S3.Accurately lay out the edge lines of the embedded parts according to the detailed drawing of the railing and mark them on the steel bars; S4. Sealing treatment of stair tread cover; S5. The embedded parts are firmly fixed at the predetermined position, and the anchor steel bars and the main steel bars of the staircase components are firmly tied with wire or spot welded; S6. Cover the stair tread cover and fix it firmly to the side vertical formwork with pins, with the spacing between the pins not exceeding 300mm; S7. The concrete is poured continuously and densely, and vibrated in place. During the vibration, the vibrating rod is kept away from the embedded parts to ensure that the surrounding areas of the embedded parts are within the influence range of the vibrating rod; S8. When the concrete strength reaches a certain level, remove the fixing nuts, stair tread covers and side formwork, and carry out maintenance in a timely manner after removal.

[0007] Preferably, the implementation steps of step S1 are: S1.1. Before construction, the professional subcontractor shall conduct in-depth design of the stair railings, clarify the specifications, models, quantity and location of the embedded parts, and confirm them with the design unit. The in-depth design drawings shall be completed one week in advance so that there is enough time for drawing review and modification; S1.2. The aluminum alloy formwork unit will carry out the aluminum formwork deepening of the staircase according to the railing deepening drawing, determine the key parameters of the formwork size and reserved hole position, and control the formwork size error within ±2mm, and the reserved hole position error within ±1mm; S1.3. Provide technical instructions to construction personnel, clarify the construction process, quality standards and safety precautions, ensure that the required materials, tools and construction personnel are fully equipped and the quality meets the relevant standards, and that construction materials arrive on site three days in advance for quality inspection and quantity verification.

[0008] Preferably, the implementation steps of step S2 are: S2.1. The order of stair reinforcement binding is stair beam first and then stair slab. The specifications, positions, quantity and length of stair beam reinforcement, slab reinforcement and distribution reinforcement shall be bound in accordance with the design requirements, with an error of no more than ±5mm; S2.2. The plate reinforcement should be anchored into the beam, and then the main reinforcement and the distribution reinforcement should be tied. The position lines of the main reinforcement and the distribution reinforcement should be drawn on the stair bottom plate. Each intersection should be tied firmly. At the same time, the key parameters of the spacing and protective layer thickness of the steel bars should be checked to ensure that they meet the requirements of the specifications. The error of the spacing of the steel bars should not exceed ±10mm, and the error of the protective layer thickness should not exceed ±5mm. S2.3. After the reinforcement is tied, an overall inspection shall be carried out to ensure that there are no missing, misplaced or deformed reinforcements. The inspection record shall record in detail the location and rectification of each problem.

[0009] Preferably, the implementation steps of step S3 are: S3.1. Accurately lay out the edge line of the embedded parts according to the detailed drawing of the handrail, and make clear marks on the steel bars. The marks should be clear and accurate to facilitate subsequent construction. The position error of the embedded parts should not exceed ±3mm; S3.2. When installing embedded parts, check the position of embedded parts according to the reserved fixing holes in the aluminum mold to ensure that the positions of embedded parts and reserved fixing holes are consistent, with an error of no more than ±1mm.

[0010] Preferably, the implementation steps of step S4 are: S4.1. The embedded parts are firmly fixed in the predetermined position, and the anchor steel bars and the main steel bars of the staircase components are firmly tied with wire or spot welded. The wires are tied tightly and firmly, and the spot welding is uniform and without omissions. After the embedded parts are fixed, they are checked to ensure that there is no looseness or deviation; S4.2. Pass the secondary fixing device through the fixing hole of the embedded part and fix it on the embedded part of the railing with a nut. The tightening torque of the nut should be controlled between 30-50 N·m to ensure that the embedded part and the secondary fixing device are firmly connected.

[0011] Preferably, the implementation steps of step S5 are: S5.1. Fix the stair tread cover plate and the side vertical formwork firmly with pins. The spacing between the pins should not exceed 250mm. The pins should be inserted vertically and fixed firmly without looseness. S5.2. When the stair tread cover is closed, the bolt rod of the secondary fixing device shall pass through the reserved fixing hole of the cover, and the exposed length of the bolt rod shall not be less than 35mm. The bolt rod shall be vertical and without bending to ensure that the nut can be tightened smoothly during the subsequent secondary fixing.

[0012] Preferably, the implementation steps of step S6 are: S6.1. Remove the nuts of the secondary fixtures that are pre-fixed on the embedded parts. Be careful when removing them to avoid damaging the embedded parts and the secondary fixtures. S6.2. After the stair tread cover is closed, nuts are used to fix the bolt rods for a second time. The tightening torque of the nuts is controlled between 40-60 N·m to ensure that the embedded parts will not move up and down or left and right during concrete pouring. At the same time, the embedded parts after secondary fixation are checked to ensure that there is no looseness or deviation.

[0013] Preferably, the implementation steps of step S7 are: S7.1. Concrete pouring is continuous and dense, and vibrated in place. When vibrating, the vibrator rod should be as far away from the embedded parts as possible to ensure that the surrounding area of ​​the embedded parts is within the range of influence of the vibrator rod. The moving speed of the vibrator rod should be controlled between 30-50cm per minute to ensure that the concrete is vibrated evenly and without bubbles; S7.2. After the concrete is poured, the surface shall be smoothed and finished. At the same time, the position of the embedded parts shall be checked to ensure that there is no concrete coverage and no deviation.

[0014] Preferably, the implementation steps of step S8 are: S8.1. When the concrete strength reaches a certain level (not less than 75% of the design strength), remove the fixing nuts, stair tread covers and side formwork. Be careful when removing to avoid damaging the concrete and embedded parts. S8.2. After demolition, maintenance work shall be carried out promptly, including watering and covering for moisture retention. The maintenance time shall be no less than 7 days to ensure that the concrete strength meets the design requirements. At the same time, the embedded parts after demolition shall be inspected to ensure that there is no damage or looseness.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention improves the accuracy of the installation position of the embedded parts while retaining the advantage of the good appearance of the aluminum alloy formwork. Before construction, the specifications, models and positions of the embedded parts are confirmed according to the detailed drawing of the railing, and fixing holes are reserved when the embedded parts are produced. At the same time, fixing holes are simultaneously reserved at corresponding positions when the aluminum alloy formwork is produced. On the basis of the initial fixing of the embedded parts, the embedded parts are fixed for a second time by a new fixing device. After the concrete pouring is completed, the fixing nuts are removed without affecting the removal of the building step formwork, thereby achieving the purpose of improving quality and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The flowchart of the construction method of the present invention based on the secondary fixation of the embedded parts of the aluminum mold stair railing; Figure 2 This is a top view of the structure after the embedded parts of the present invention are processed; Figure 3 For the present invention Figure 2 The structure diagram of the embedded parts is cut along the [1-1] direction; Figure 4 It is a schematic diagram of the fixing structure of the embedded parts of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1 See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The present invention proposes a construction method based on secondary fixing of embedded parts of aluminum mold stair railings, comprising the following steps: S1. Provide technical explanations to construction personnel before construction, and ensure that all necessary materials, tools and construction personnel are fully equipped; S2. The specifications, positions, quantities and lengths of the stair beam reinforcement, plate reinforcement and distribution reinforcement shall meet the design requirements; S3.Accurately lay out the edge lines of the embedded parts according to the detailed drawing of the railing and mark them on the steel bars; S4. Sealing treatment of stair tread cover; S5. The embedded parts are firmly fixed at the predetermined position, and the anchor steel bars and the main steel bars of the staircase components are firmly tied with wire or spot welded; S6. Cover the stair tread cover and fix it firmly to the side vertical formwork with pins, with the spacing between the pins not exceeding 300mm; S7. The concrete is poured continuously and densely, and vibrated in place. During the vibration, the vibrating rod is kept away from the embedded parts to ensure that the surrounding areas of the embedded parts are within the influence range of the vibrating rod; S8. When the concrete strength reaches a certain level, remove the fixing nuts, stair tread covers and side formwork, and carry out maintenance in a timely manner after removal.

[0019] In this embodiment, it should be noted that the implementation steps of step S1 are: S1.1. Before construction, the professional subcontractor shall conduct in-depth design of the stair railings, clarify the specifications, models, quantity and location of the embedded parts, and confirm them with the design unit. The in-depth design drawings shall be completed one week in advance so that there is enough time for drawing review and modification; S1.2. The aluminum alloy formwork unit will carry out the aluminum formwork deepening of the staircase according to the railing deepening drawing, determine the key parameters of the formwork size and reserved hole position, and control the formwork size error within ±2mm, and the reserved hole position error within ±1mm; S1.3. Provide technical instructions to construction personnel, clarify the construction process, quality standards and safety precautions, ensure that the required materials, tools and construction personnel are fully equipped and the quality meets the relevant standards, and that construction materials arrive on site three days in advance for quality inspection and quantity verification.

[0020] In this embodiment, it should be noted that the implementation steps of step S2 are: S2.1. The order of stair reinforcement binding is stair beam first and then stair slab. The specifications, positions, quantity and length of stair beam reinforcement, slab reinforcement and distribution reinforcement shall be bound in accordance with the design requirements, with an error of no more than ±5mm; S2.2. The plate reinforcement should be anchored into the beam, and then the main reinforcement and the distribution reinforcement should be tied. The position lines of the main reinforcement and the distribution reinforcement should be drawn on the stair bottom plate. Each intersection should be tied firmly. At the same time, the key parameters of the spacing and protective layer thickness of the steel bars should be checked to ensure that they meet the requirements of the specifications. The error of the spacing of the steel bars should not exceed ±10mm, and the error of the protective layer thickness should not exceed ±5mm. S2.3. After the reinforcement is tied, an overall inspection shall be carried out to ensure that there are no missing, misplaced or deformed reinforcements. The inspection record shall record in detail the location and rectification of each problem.

[0021] In this embodiment, it should be noted that the implementation steps of step S3 are: S3.1. Accurately lay out the edge line of the embedded parts according to the detailed drawing of the handrail, and make clear marks on the steel bars. The marks should be clear and accurate to facilitate subsequent construction. The position error of the embedded parts should not exceed ±3mm; S3.2. When installing embedded parts, check the position of embedded parts according to the reserved fixing holes in the aluminum mold to ensure that the positions of embedded parts and reserved fixing holes are consistent, with an error of no more than ±1mm.

[0022] In this embodiment, it should be noted that the implementation steps of step S4 are: S4.1. The embedded parts are firmly fixed in the predetermined position, and the anchor steel bars and the main steel bars of the staircase components are firmly tied with wire or spot welded. The wires are tied tightly and firmly, and the spot welding is uniform and without omissions. After the embedded parts are fixed, they are checked to ensure that there is no looseness or deviation; S4.2. Pass the secondary fixing device through the fixing hole of the embedded part and fix it on the embedded part of the railing with a nut. The tightening torque of the nut should be controlled between 30-50 N·m to ensure that the embedded part and the secondary fixing device are firmly connected.

[0023] In this embodiment, it should be noted that the implementation steps of step S5 are: S5.1. Fix the stair tread cover plate and the side vertical formwork firmly with pins. The spacing between the pins should not exceed 250mm. The pins should be inserted vertically and fixed firmly without looseness. S5.2. When the stair tread cover is closed, the bolt rod of the secondary fixing device shall pass through the reserved fixing hole of the cover, and the exposed length of the bolt rod shall not be less than 35mm. The bolt rod shall be vertical and without bending to ensure that the nut can be tightened smoothly during the subsequent secondary fixing.

[0024] In this embodiment, it should be noted that the implementation steps of step S6 are: S6.1. Remove the nuts of the secondary fixtures that are pre-fixed on the embedded parts. Be careful when removing them to avoid damaging the embedded parts and the secondary fixtures. S6.2. After the stair tread cover is closed, nuts are used to fix the bolt rods for a second time. The tightening torque of the nuts is controlled between 40-60 N·m to ensure that the embedded parts will not move up and down or left and right during concrete pouring. At the same time, the embedded parts after secondary fixation are checked to ensure that there is no looseness or deviation.

[0025] In this embodiment, it should be noted that the implementation steps of step S7 are: S7.1. Concrete pouring is continuous and dense, and vibrated in place. When vibrating, the vibrator rod should be as far away from the embedded parts as possible to ensure that the surrounding area of ​​the embedded parts is within the range of influence of the vibrator rod. The moving speed of the vibrator rod should be controlled between 30-50cm per minute to ensure that the concrete is vibrated evenly and without bubbles; S7.2. After the concrete is poured, the surface shall be smoothed and finished. At the same time, the position of the embedded parts shall be checked to ensure that there is no concrete coverage and no deviation.

[0026] In this embodiment, it should be noted that the implementation steps of step S8 are: S8.1. When the concrete strength reaches a certain level (not less than 75% of the design strength), remove the fixing nuts, stair tread covers and side formwork. Be careful when removing to avoid damaging the concrete and embedded parts. S8.2. After demolition, maintenance work shall be carried out promptly, including watering and covering for moisture retention. The maintenance time shall be no less than 7 days to ensure that the concrete strength meets the design requirements. At the same time, the embedded parts after demolition shall be inspected to ensure that there is no damage or looseness.

[0027] Example 2 See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 In practical application, the invention proposes a construction method based on secondary fixing of embedded parts of aluminum mold stair railings, which specifically includes the following steps: (1) Before construction, the construction personnel should be given a thorough technical briefing and the necessary materials, tools and construction personnel should be fully equipped. Specifically, the following steps are included: (1.1) Before construction, the professional subcontractor shall conduct in-depth design of the stair railings, clarify the specifications, models, quantity and location of the embedded parts, and confirm them with the design unit. The in-depth design drawings shall be completed one week in advance so that there is enough time for drawing review and modification; (1.2) The aluminum alloy formwork unit will carry out the aluminum formwork deepening of the staircase according to the railing deepening drawing, determine the key parameters of the formwork size and reserved hole position, and control the formwork size error within ±2mm, and the reserved hole position error within ±1mm; (1.3) Provide technical instructions to construction personnel, clarify the construction process, quality standards and safety precautions, ensure that the required materials, tools and construction personnel are fully equipped and the quality meets the relevant standards, and that the construction materials arrive on site three days in advance for quality inspection and quantity verification; (2) The specifications, positions, quantity and length of the stair beam reinforcement, plate reinforcement and distribution reinforcement meet the design requirements. Specifically, the following steps are included: (2.1) The order of tying the staircase reinforcement is to tie the staircase beam first and then the staircase slab. The specifications, positions, quantities and lengths of the staircase beam reinforcement, slab reinforcement and distribution reinforcement shall be tied in accordance with the design requirements, with an error of no more than ±5mm; (2.2) The plate reinforcement should be anchored into the beam, and then the main reinforcement and the distribution reinforcement should be tied. The position lines of the main reinforcement and the distribution reinforcement should be drawn on the stair bottom plate. Each intersection should be tied firmly. At the same time, the key parameters of the spacing of the steel bars and the thickness of the protective layer should be checked to ensure that they meet the requirements of the specifications. The error of the spacing of the steel bars shall not exceed ±10mm, and the error of the protective layer thickness shall not exceed ±5mm. (2.3) After the steel bars are tied, an overall inspection is carried out to ensure that there are no missing steel bars, no misalignment, and no deformation problems. The inspection record shall record in detail the location and rectification of each problem; (3) Accurately lay out the edge lines of the embedded parts according to the detailed drawing of the railing and mark them on the steel bars. Specifically, the following steps are included: (3.1) Accurately lay out the edge lines of the embedded parts according to the detailed drawing of the handrail, and make clear marks on the steel bars. The marks should be clear and accurate to facilitate subsequent construction. The position error of the embedded parts should not exceed ±3mm; (3.2) When installing embedded parts, check the position of embedded parts according to the reserved fixing holes in the aluminum mold to ensure that the positions of embedded parts and reserved fixing holes are consistent, with an error of no more than ±1mm; (4) The sealing treatment of stair tread cover plate includes the following steps: (4.1) The embedded parts are firmly fixed in the predetermined position, and the anchor steel bars and the main steel bars of the staircase components are firmly tied with wire or spot welded. The wires are tied tightly and firmly, and the spot welding is uniform and without omissions. After the embedded parts are fixed, they are checked to ensure that there is no looseness or deviation; (4.2) Pass the secondary fixing device through the fixing hole of the embedded part and fix it to the embedded part of the railing with a nut. The tightening torque of the nut should be controlled between 30-50N·m to ensure that the embedded part and the secondary fixing device are firmly connected; (5) The embedded parts are firmly fixed at the predetermined position, and the anchor steel bars are firmly tied to the main steel bars of the staircase components with wire or spot welded. Specifically, the following steps are included: (5.1) The stair tread cover plate is fixed firmly to the side vertical formwork with pins. The spacing between the pins should not exceed 250mm. The pins should be inserted vertically and fixed firmly without looseness. (5.2) When the stair tread cover is closed, the bolt rod of the secondary fixing device passes through the reserved fixing hole of the cover, and the exposed length of the bolt rod is not less than 35mm. The bolt rod is vertical and has no bends to ensure that the nut can be tightened smoothly during the subsequent secondary fixing; (6) Cover the stair tread cover plate and fix it firmly to the side vertical formwork with pins, with the pin spacing not exceeding 300 mm. Specifically, the following steps are included: (6.1) Remove the secondary fixture nuts pre-fixed on the embedded parts. Be careful when removing to avoid damaging the embedded parts and secondary fixtures; (6.2) After the stair tread cover is closed, nuts are used to fix the bolt rods for a second time. The tightening torque of the nuts is controlled between 40-60 N·m to ensure that the embedded parts will not move up and down or left and right during concrete pouring. At the same time, the embedded parts after secondary fixation are checked to ensure that there is no looseness or deviation; (7) The concrete is poured continuously and densely, and vibrated in place. During the vibration, the vibrating rod is kept away from the embedded parts to ensure that the surrounding areas of the embedded parts are within the influence range of the vibrating rod. Specifically, the following steps are included: (7.1) The concrete is poured continuously and densely, and vibrated in place. When vibrating, the vibrator rod is as far away from the embedded parts as possible to ensure that the surrounding area of ​​the embedded parts is within the range of influence of the vibrator rod. The moving speed of the vibrator rod is controlled between 30-50cm per minute to ensure that the concrete is vibrated evenly and without bubbles; (7.2) After the concrete pouring is completed, the surface is smoothed and finished. At the same time, the position of the embedded parts is checked to ensure that there is no concrete coverage and no deviation; (8) When the concrete strength reaches a certain level, remove the fixing nuts, stair tread cover and side formwork, and perform maintenance in a timely manner after removal. Specifically, the following steps are included: (8.1) When the concrete strength reaches a certain level (not less than 75% of the design strength), remove the fixing nuts, stair tread covers and side formwork. Be careful when removing to avoid damaging the concrete and embedded parts. (8.2) After demolition, maintenance work shall be carried out promptly, including watering and covering to keep the concrete moist. The maintenance time shall be no less than 7 days to ensure that the concrete strength meets the design requirements. At the same time, the embedded parts after demolition shall be inspected to ensure that there is no damage or looseness.

[0028] Through the above steps, not only the advantage of good concrete molding appearance quality of the aluminum alloy formwork process is retained, but also the problems of increased repair costs for concrete structure damage and poor molding quality of the railing base caused by post-embedded parts are avoided. At the same time, the new stair railing embedded part fixing device is easy to process and manufacture, and can be factory-processed and mass-produced. At the same time, the materials are easy to obtain and the cost is low. This construction method of secondary fixation of aluminum mold embedded parts can be promoted and applied to the installation and fixation of all concrete embedded parts, and can effectively solve the problem of embedded part deviation. It is not limited to the installation of stair railing embedded parts, but can also be applied to the installation and fixation of horizontal or vertical embedded parts of curtain walls.

[0029] In summary, the present invention improves the accuracy of the installation position of the embedded parts while retaining the advantage of the good appearance of the aluminum alloy formwork. Before construction, the specifications, models, and positions of the embedded parts are confirmed according to the detailed drawing of the railings, and fixing holes are reserved when the embedded parts are produced. At the same time, fixing holes are simultaneously reserved at corresponding positions when the aluminum alloy formwork is produced. On the basis of the initial fixing of the embedded parts, the embedded parts are fixed for a second time by a new fixing device. After the concrete pouring is completed, the fixing nuts are removed without affecting the removal of the building step formwork, thereby achieving the purpose of improving quality and increasing efficiency.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical uses of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A construction method based on secondary fixing of embedded parts of aluminum mold stair railings, characterized in that: The following steps are involved: S1. Provide technical explanations to construction personnel before construction, and ensure that all necessary materials, tools and construction personnel are fully equipped; S2. Measure the specifications, positions, quantity and length of stair beam reinforcement, plate reinforcement and distribution reinforcement; S3.Accurately lay out the edge lines of the embedded parts according to the detailed drawing of the railing and mark them on the steel bars; S4. Carry out sealing treatment on stair tread cover; S5. Fix the embedded parts at the predetermined position, and tie the anchor steel bars and the main steel bars of the staircase components firmly with wire or spot weld them; S6. Cover the stair tread cover and fix it firmly to the side vertical formwork with pins, with the spacing between the pins not exceeding 300mm; S7. The concrete is poured continuously and densely, and vibrated in place. During the vibration, the vibrating rod is kept away from the embedded parts to ensure that the surrounding areas of the embedded parts are within the influence range of the vibrating rod; S8. When the concrete strength reaches a certain level, remove the fixing nuts, stair tread covers and side formwork, and carry out maintenance in a timely manner after removal.

2. A construction method based on secondary fixing of embedded parts of aluminum mold stair railings according to claim 1, characterized in that: The implementation steps of step S1 are: S1.

1. Before construction, the professional subcontractor shall conduct in-depth design of the stair railings, clarify the specifications, models, quantity and location of the embedded parts, and confirm them with the design unit. The in-depth design drawings shall be completed one week in advance so that there is enough time for drawing review and modification; S1.

2. The aluminum alloy formwork unit will carry out the aluminum formwork deepening of the staircase according to the railing deepening drawing, determine the key parameters of the formwork size and reserved hole position, and control the formwork size error within ±2mm, and the reserved hole position error within ±1mm; S1.

3. Provide technical instructions to construction personnel and clarify the construction process, quality standards and safety precautions.

3. A construction method based on secondary fixing of embedded parts of aluminum mold stair railings according to claim 2, characterized in that: The implementation steps of step S2 are: S2.

1. The order of stair reinforcement binding is stair beam first and then stair slab. The specifications, positions, quantity and length of stair beam reinforcement, slab reinforcement and distribution reinforcement shall be bound in accordance with the design requirements, with an error of no more than ±5mm; S2.

2. The plate reinforcement should be anchored into the beam, and then the main reinforcement and the distribution reinforcement should be tied. The position lines of the main reinforcement and the distribution reinforcement should be drawn on the stair bottom plate. Each intersection should be tied firmly. At the same time, the key parameters of the spacing of the steel bars and the thickness of the protective layer should be checked. The error of the spacing of the steel bars should not exceed ±10mm, and the error of the protective layer thickness should not exceed ±5mm. S2.

3. After the reinforcement is tied, conduct an overall inspection and record the location and rectification of each problem in detail.

4. A construction method based on secondary fixing of embedded parts of aluminum mold stair railings according to claim 3, characterized in that: The implementation steps of step S3 are: S3.

1. Accurately lay out the edge line of the embedded parts according to the detailed drawing of the handrail, and make clear marks on the steel bars. The marks should be clear and accurate, and the position error of the embedded parts should not exceed ±3mm; S3.

2. When installing embedded parts, check the position of embedded parts according to the reserved fixing holes in the aluminum mold. The position error between embedded parts and reserved fixing holes shall not exceed ±1mm.

5. A construction method based on secondary fixing of embedded parts of aluminum mold stair railings according to claim 4, characterized in that: The implementation steps of step S4 are: S4.

1. The embedded parts are firmly fixed in the predetermined position, and the anchor steel bars and the main steel bars of the staircase components are firmly tied with wire or spot welded. The wires are tied tightly and firmly, and the spot welding is uniform and without omissions. After the embedded parts are fixed, they are inspected; S4.

2. Pass the secondary fixing device through the fixing hole of the embedded part and fix it to the embedded part of the railing with a nut. The tightening torque of the nut should be controlled between 30-50 N·m.

6. A construction method based on secondary fixing of embedded parts of aluminum mold stair railings according to claim 5, characterized in that: The implementation steps of step S5 are: S5.

1. Fix the stair tread cover plate and the side vertical formwork firmly with pins. The spacing between the pins should not exceed 250mm. The pins should be inserted vertically and fixed firmly without looseness. S5.

2. When the stair tread cover is closed, the bolt rod of the secondary fixing device shall pass through the reserved fixing hole of the cover, and the exposed length of the bolt rod shall not be less than 35mm. The bolt rod shall be vertical and without bending.

7. A construction method based on secondary fixing of embedded parts of aluminum mold stair railings according to claim 6, characterized in that: The implementation steps of step S6 are: S6.

1. Remove the nuts of the secondary fixtures that are pre-fixed on the embedded parts. Be careful when removing them to avoid damaging the embedded parts and the secondary fixtures. S6.

2. After the stair tread cover is closed, nuts are used to fix the bolt rods for a second time. The tightening torque of the nuts is controlled between 40-60 N·m. At the same time, the embedded parts after the second fixation are checked.

8. The construction method based on secondary fixing of embedded parts of aluminum mold stair railings according to claim 7 is characterized in that: The implementation steps of step S7 are: S7.

1. Concrete pouring is continuous and dense, and the vibrator is in place. When vibrating, the vibrator rod is as far away from the embedded parts as possible to ensure that the surrounding area of ​​the embedded parts is within the range of influence of the vibrator rod. The moving speed of the vibrator rod is controlled between 30-50cm per minute; S7.

2. After the concrete is poured, the surface shall be smoothed and finished, and the position of the embedded parts shall be checked.

9. A construction method based on secondary fixing of embedded parts of aluminum mold stair railings according to claim 8, characterized in that: The implementation steps of step S8 are: S8.

1. When the concrete strength reaches a certain level, remove the fixing nuts, stair tread covers and side formwork. Be careful when removing to avoid damaging the concrete and embedded parts. S8.

2. After demolition, maintenance work shall be carried out promptly, including watering and covering to keep the surface moist. The maintenance time shall be no less than 7 days. At the same time, the embedded parts shall be inspected after demolition.

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