by 1.
Reserved and embedded construction flow chart 1.1 Reserved and embedded construction flow chart 2.
Casing installation process 2.1 Casing production According to the comprehensive electromechanical pipeline diagram, the professional engineer shall count the number of rigid waterproof casing, flexible waterproof casing and general packing casing layer by layer and part by part, and determine the length of embedded casing according to the thickness of the structural wall, and provide a detailed list of various types of casing; The position and displacement deviation of the reserved holes shall meet the specification requirements and within the allowable deviation value.
See the following table for the requirements of the casing: the specific requirements of the serial number items: 1.
The casing model.
The pipe diameter of the casing is larger than the crossing pipe.
2.
The length of the casing through the wall.
The wall thickness+the plastering thickness on both sides.
3.
The length of the casing through the floor.
The floor thickness+the plastering thickness on both sides+20mm (50mm in the toilet).
4.
The two ends of other casings shall be flush, burr removed, rust removed, and anti-corrosion, The reserved position of the casing in the concrete shall be accurate, the two ends of the wall shall be flat with the finish, and the lower end of the floor shall be flat with the floor finish.
2.1 Actual casing production 2.2 Casing selection 2.3 After the casing is installed and the main structure reinforcement is bound, the location shall be aligned according to the geometric dimensions of the detailed design drawing, and then the rigid waterproof casing shall be placed in the reinforcement for reinforcement.
The floor casing secondary structure wall casing uses structural reinforcement or additional reinforcement to reinforce the casing.
The intersection of the “#” reinforcement and the intersection of the casing and reinforcement shall be welded to make the casing firmly fixed in the reinforcement mesh.
The flexible waterproof casing shall protect the bolt hole of the flange to prevent the concrete from blocking the bolt hole, which is not conducive to the installation of the flange gland of the flexible waterproof casing in the later period.
General packing casing installation General packing casing installation.
In order to prevent position deviation during embedding, 4 additional reinforcements shall be used to hoop the embedded pipe and junction box, and then bound firmly with the main reinforcement.
The limit bar shall be close to the junction box and bound with the main bar with thick iron wire.
Spot welding of the main bar is not allowed.
1 – Main reinforcement 2-12 # lead wire binding 3 – Wire box 4 – Electric welding 5 – Installation of additional reinforcement wire box: the installation position and elevation are accurate 4.
Key points of embedded wire pipe 4.1 Key points of embedded wire pipe installation A.
The arrangement of pipelines cannot be close together, and the gap is not less than 20mm at least.
The crossing of pipelines cannot overlap three layers or more to avoid affecting the floor elevation.
The shortest route must be taken for the laying of PVC conduits.
B.
The straight pipe shall be fixed and bound with binding wire every 1m, and the junction of the junction box and the lamp head box shall be fixed and bound 50mm to the left and right.
C.
The reserved length of PVC line pipe orifice from bottom to top shall be controlled within 80mm for the convenience of finished product protection in the future.
The reserved length of pipe orifice from top to bottom shall be controlled within 100mm to avoid bending and breaking of line pipe in masonry construction in the future, and it cannot be connected during secondary piping D.
The maximum pipe diameter of the line pipe in the middle of the wall should not exceed 50 mm, and in the floor should not exceed 25 mm.
The distance between the line pipe and the surface of buildings and structures should not be less than 15 mm, and the angle of the line pipe corner should be greater than 90 degrees.
4.2 Embedded line pipe installation Physical line pipe installation Line pipe installation Line pipe installation Specification, binding firm PVC line pipe installation Line pipe laying spacing specification, binding firm line box and exposed pipe finished product protection in place Line pipe installation Galvanized pipe concealed laying horizontal and vertical, spacing consistent, binding firm line box and exposed pipe finished product protection in place 5, secondary embedment 5.1 Key points of secondary embedment construction When insulating pipe is cut and buried on masonry, the groove width and groove depth are 5mm~10mm larger than the pipe outer diameter, Cement mortar with strength grade no less than M10 shall be used for plastering protection, and the mortar for slot repair shall be 2mm lower than the wall surface.
Laying of masonry wall conduits Laying of masonry wall boxes Installation of masonry wall boxes Laying of masonry wall boxes Template 5.3 Laying of secondary embedded physical conduits Drawing, slotting, fixing, cutting, slotting, slotting Complete laying of pipes and pipe fixing, plastering, embedding of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, positioning of boxes, slotting of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes, laying of boxes In order to ensure the accuracy of the reservation and embedment, the following preparations should be made before construction: 1.
Carefully compare the professional drawings of wind, water, electricity and weak current, architectural and structural drawings, and check the positions of the reserved holes marked on the architectural structural drawings.
If the positions and elevations are inconsistent, go through engineering negotiations in time and make corrections during construction.
For those not marked in the structural drawing, the position, elevation and size of the holes to be reserved shall be clearly marked on the structural drawing according to the mechanical and electrical drawings.
2.
The construction personnel must cooperate with the civil engineering to reserve and embed pipelines, iron components, equipment foundations and holes according to the construction drawings and detailed design drawings.
During the structural construction, the reservation and embedment shall follow the structural progress closely.
When conditions permit, the construction shall be carried out in a timely manner, and the concealed pre inspection and inspection work shall be done well.
It is strictly prohibited to leave by mistake or by omission.
3.
The site engineer shall refer to the construction drawings for technical review before concrete pouring and concealment to confirm the location, size and quantity of various embedded parts and reserved holes, and the direction of embedded conduits shall be consistent with the drawings.
Check the fixation of various embedded parts and reinforcement formwork to prevent deviation during concrete pouring.
4.
All metal embedded parts shall be rustproof and anti-corrosion inside and outside.
If the anti-corrosion coating is damaged during construction, it shall be brushed in time.
5.
Pay attention to the special provisions of special places or special disciplines, such as the requirements for embedded materials in civil air defense areas, the model and elevation requirements of kindergarten sockets, etc.
2、 Key points for quality control of concealed electrical piping 1.
Concealed wire and pipeline should be laid along the nearest route and the bending and crossing should be minimized.
The bending radius should not be less than 6 times of the outer diameter of the pipe, and there should be no cracks or significant dents after bending.
The clear distance from the surface should not be less than 15mm.
There should be a gap between parallel pipes..
