by When pipeline separation is not implemented for prefabricated buildings, electromechanical and equipment pipelines need to be reserved in prefabricated components.
Relevant professional designers need to accurately design the pipelines, junction boxes, casings and holes before the detailed design of prefabricated components.
Based on this, the detailed designer of prefabricated components shall reserve and embed the prefabricated components to meet the construction requirements of civil engineering and decoration.
01 layout of electromechanical reserved and embedded laminated plate pipelines when prefabricated laminated plates are used as horizontal components, horizontal electromechanical pipelines generally need to be laid in the cast-in-place floor of the floor, and the lighting fixtures, fire detectors and other equipment in the laminated floor need to reserve junction boxes or threading holes to connect with the pipelines in the cast-in-place floor of the laminated floor.
When the water and electricity pipelines are exposed in the ceiling, the junction box may not be reserved on the laminated plate.
Reservation of electrical points within the ceiling range when the lighting fixtures and other points on the floor are within the ceiling range, they are laid in the open or in the dark according to the laying of pipelines, which can be divided into two forms: reservation on components and installation after the completion of floor casting.
When the pipeline is exposed in the ceiling, the points in the ceiling may not be reserved on the prefabricated laminated plate, or within the same ceiling, the points in the same circuit shall be reserved on the prefabricated laminated plate, and other points shall be exposed installed from the lead of the box.
However, for the electrical points of different circuits, if points need to be reserved, separate boxes shall be reserved.
At the same time, the position of the junction box in the ceiling can be adjusted appropriately to avoid the situation that it is not suitable to place the point.
In addition, in the same ceiling, if there is a structural beam, and the space under the beam is not enough for pipe laying, and the pipeline cannot pass through the beam due to structural or construction conditions, in this case, two junction boxes shall be arranged on both sides of the beam for point connection on both sides of the beam.
Electrical points within the ceiling range shall be reserved for those within the original ceiling range.
Pipelines are generally concealed in the cast-in-place layer of the floor slab.
At this time, junction boxes shall be reserved at the points, and each point shall be reserved; At the same time, if there is no ceiling within the partition wall, the high-level socket and control switch at this position generally need to reserve pipe holes on the floor.
If the point position within the original top range is just at the edge of the prefabricated laminated slab, and the point position cannot be moved and adjusted as required by the fine decoration, this situation should be avoided by adjusting the position of the cast-in-place strip.
Reservation of junction boxes in the transition area between the original ceiling and the ceiling.
When an electrical circuit runs through the original ceiling and the ceiling, if the electrical points and pipelines in the ceiling are laid in an open manner, then a boundary crossing box needs to be reserved at the boundary between the ceiling and the original ceiling.
The material and type of the boundary crossing box are the same as those of the ordinary junction box.
02 reservation and embedment of kitchen and bathroom risers in order to reduce the reservation and embedment of prefabricated components, facilitate processing, construction and installation, and save costs, the toilet and kitchen areas generally use cast-in-place floor slabs.
When prefabricated composite floor slabs are required, the relevant professional designers need to accurately determine the position of each riser on the drawings, and the deepening designers of prefabricated components reserve round holes, notches, or sleeves on the floor slabs according to the site requirements, The equipment reservation and embedment involved in the floor mainly includes riser, sewer and floor drain.
When the reserved casing is used, the specification of the casing is generally confirmed and provided by the design unit and the construction unit.
It is a common treatment method for equipment pipelines to adopt reserved holes / notches on prefabricated laminated plates.
The hole diameter of the reserved holes is generally 50~100mm larger than the outer diameter of the pipeline, and the hole edge is generally 50mm away from the plate edge.
After the hoisting is completed, the casing shall be buried on site for the later installation of water pipes.
When the reserved hole is large and close to the edge of the laminated plate, or because there are several adjacent holes at the same position, in this case, for the consideration of component manufacturing and finished product protection, the reserved gap can also be used to solve the problem of on-site pipeline installation.
The embedded casing is used for equipment pipelines.
For the sake of waterproof and seepage prevention, the equipment casing can also be formed at one time in the prefabricated component factory.
For the dry area, the form of reserved holes is generally used.
For the wet area, the casing is required.
The embedded water stop joint is usually used for the sewer and floor drain.
The diameter of the water stop joint and casing shall meet the requirements of the pipeline installed on site.
In order to reserve the operation space for dismantling the cast-in-situ formwork, the outer diameter of the casing is required to be 80mm~100mm away from the beam or wall.
For the steel casing with wing ring, the width and height of the wing ring shall be taken into account to avoid affecting the production of components; The height of casing shall be a certain height higher than the finished surface of the building according to the construction requirements, which is usually 20mm.
At the same time, the height of falling plate shall be comprehensively considered.
For the roof layer, the casing height is usually high.
Because of the process conditions, it is difficult for the component factory to produce.
In this case, the reserved gap can be used to install the casing on site…
