The components shall be placed accurately according to the control line with crowbars.

After installation, they can be used as on-site construction channels immediately, with the advantages of convenience and speed.

(3) Tighten the eyebolts and embedded sleeves, adjust the length of the rigging iron chain, make the rest platform of the stair section horizontal, try to lift the precast stair board, check whether the lifting point position is accurate, and whether the force on the slings is uniform; The trial lifting height shall not exceed 1m.

As far as the current production process of precast stairs is concerned, the general steel mold design includes horizontal and lying type.

Remove the mold, hoist and construct the process01.

At the same time, the use of precast stairs instead of cast-in-place stairs can effectively avoid the cost of chiseling due to the insufficient flatness of the finished surface of the structure.

They are produced in the prefabrication factory, and finally transported to the construction site for installation.

(3) When pouring structural node concrete, cover the surface of precast stair components to prevent pollution.

Text | Edited by Li Taotao | Reviewed by Feng Qian | Xu Huiyan and Pang Hongjin..

Maintain; 6.

Install the mold; 4.

Therefore, the molding effect of precast stairs is far better than that of cast-in-place stairs.

(5) When the precast stair is in place, the reinforcement of one end of the stair section shall be anchored into the (laminated beam) beam, and the shelving length shall be 15mm; The rebar at the other end extends into the rest platform and is placed on the rest platform formwork.

The quality of stairs is not only the quality of individual components, but also the safety quality of the entire project.

In the finished precast stair components, the stair drip line, the anti-skid groove of the step and the embedded parts of the guardrail are formed at one time during production to ensure the standardization of component production.

The produced precast products have high quality standards, good appearance, and have the aesthetic effect of fair faced concrete.

During the design of precast stairs, special connection methods shall be adopted according to their stress characteristics to make them connect with the cast-in-place structure as a whole, so as to meet the requirements of structural bearing capacity and deformation.

Production process of cast-in-place precast stairs: 1.

Precast concrete components Precast stairs Precast stairs Precast stairs are one of the components commonly used in precast buildings.

02 Production characteristics Generally, cast-in-place stairs are made of formwork support system and poured on site; The precast stairs are produced in the factory with steel moulds.

(6) After installation, recheck the stair elevation and stairwell width.

Process flow: hoist the precast stairs in place → correct the elevation and axis position → temporarily fix → support → loosen the hook; 02.

With the continuous improvement of assembly rate in China’s construction industry and the continuous leap of building industrialization, precast stairs play an important role in precast buildings.

In addition, the weight of precast stair components should also be strictly controlled in the design stage, which is generally controlled within 3 tons at present.

Generally, the upper end of precast stairs adopts fixed end connection node, and the lower end adopts sliding connection node, which can not only meet the stability of its structure, but also meet the requirements of the deformation capacity of components in the earthquake process.

This kind of set shaped steel mould can effectively avoid the error caused by re assembling the formwork in the traditional process, and the same steel mould can be recycled, which can greatly save costs.

Therefore, in the production process, precast stairs can reduce many disadvantages in the production process of cast-in-place stairs.

Thank you for your concern and support as always.

Features of precast staircases 01 Design features The rationality and economy of the design scheme of precast staircases directly affect the cost of project costs.

03 Quality requirements (1) The precast stair components should be filled with flexible gaskets at the components and rigid shelving points during transportation.

03 Molding characteristics The surface of stairs in residential projects is mostly plastered with cement mortar, while the finished surface of precast stairs can reach the decoration level, without secondary plastering.

In the design process, the influence of the lifting distance and weight of tower cranes on the weight design of components should also be considered.

The fewer the design specifications of precast staircases, the greater the utilization of steel molds.

(2) Check the embedded sleeve screw position, screw thread integrity, single piece weight, number, etc.

Precast stair stacking Precast stair hoisting Precast stair finished product protection requirements (4) Ensure that the rest platform of the precast stair segment is kept level during hoisting; The adjustable transverse lifting beam shall be used for balanced lifting in place, and the lifting points must be 4 or more.

Plastic Nail Plate

Clean the mold, brush the release agent; 2.

In the production of precast stairs, the embedded parts of handrails can be embedded in advance, and the structures such as anti-skid strips and drip lines can be cast in one time through fixed mold production to reduce the secondary treatment process of on-site stairs; At the same time, the precast stair has higher quality and better appearance than the cast-in-place stair, and has the aesthetic effect of fair faced concrete.

The components shall be shelved stably.

Operation process: (1) Check the stair rest platform, beam opening and elevation before hoisting the precast stair components.

(2) After the installation of components, the stair treads should be protected by wooden strips or aluminum corner strips.

The shelving length shall be accurate.

Bind the steel bars; 3.

before hoisting the precast stair components.

This can reduce the lifting configuration of tower cranes and the rental costs of tower cranes.

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Pour concrete; 5.