(4) The gap between casing and pipeline is blocked, with many points and wide areas, which is easy to be omitted.
2、 The floor reserved hole eliminates the traditional reserved methods such as wooden box, iron box and plastic casing to avoid mold running, deformation and other disadvantages.
The wall casing must be embedded when the reserved height of civil masonry or the reinforcement is bound to the casing height.
(2) Pipe insulation is not considered in casing setting.
[corrective measures] (1) the pipe casing at the same position shall be adjusted in line.
(3) The center deviation between casing and pipeline is large.
Problem example 2: casing is different in height and offset [existing problem] (1) casing at the same position is uneven in height.
The casing is correctly positioned and firmly fixed.
a.
(2) The general steel casing shall be cleaned and coated with release agent.
(5) After the pipeline is installed, the non combustible material shall be used for sealing between the pipeline and the casing in time.
c.
[main reasons] (1) lack of understanding of relevant specifications, and the setting of casing for pipeline crossing floor or wall was not considered in various work preparations before construction.
a.
Reinforcement shall be used around the casing passing through the shear wall and fixed by electric welding to prevent displacement during concrete pouring.
(3) The casing shall be fixed firmly and reliably.
Problem example 1: the pipe installation project crossing the floor or wall [existing problem] the through wall pipe is not provided with through wall casing according to the specification requirements.
a.
At the same time, the bottom opening of the reserved box is blocked with steel plate.
(2) The thickness of pipe insulation layer is not considered when the insulating pipe casing is embedded.
When making, the casing height is 250mm, the casing pipe diameter is two grades larger than the pipe diameter designed in the drawing, and one is welded 80mm away from the upper opening of the reserved box Φ 6.
Rust paint shall be applied inside the casing.
(2) The pipe well shall be comprehensively arranged in advance to determine the specification, quantity and installation position of casing.
[corrective measures] (1) carefully check whether the casing is missing when the pipeline crosses the floor or wall.
b.
The specification and size of reserved holes shall be correct.
[preventive measures] in strict accordance with the requirements of code for acceptance of construction quality of building water supply, drainage and heating engineering, metal or plastic casing shall be set when the pipeline crosses the floor or wall.
(3) Pay attention to the specification of casing for insulated pipeline and non insulated pipeline, and make construction technical disclosure.
Similarly, the surrounding area shall be reinforced with reinforcement and fixed with electric welding to prevent the casing from shifting during concrete pouring.
(3) Readjust the casing to ensure that the casing height is consistent and concentric with the pipeline.
[preventive measures] (1) strictly implement the requirements of code for acceptance of construction quality of building water supply, drainage and heating engineering: the top of the casing installed in the floor shall be 20mm higher than the decorative floor; The top of the casing installed in the toilet and kitchen shall be 50mm higher than the decorative floor; There are multiple pipes at the same position, and the height of the casing above the decorative floor shall be the same.
The position of reserved holes shall be correct.
(3) During casing installation, the positioning is inaccurate, the fixation is not firm, and the perpendicularity deviation is large.
The reserved opening shall be smooth and complete.
(4) The casing shall be accurately positioned and firmly fixed during installation to ensure consistency with the center of the pipeline.
c.
The outside of the casing shall be cleaned and brushed with release agent.
Installation of wall waterproof casing.
After the formwork is supported, the casing passing through the floor shall be buried when binding the reinforcement.
(2) For pipes with insulation, the thickness of insulation layer shall be considered in advance, and casing shall be set to match it.
Site practice of new project: (1) the reserved hole position is correct, and the hole size meets the design and specification requirements.
(4) Control the formwork drawing time (the formwork drawing time shall be subject to the civil engineering requirements), the cave in will occur too early, and the formwork will be given too late, which will cause difficulties and damage the integrity of the cave.
(2) The casing shall be repaired before the civil engineering opening is repaired.
(4) There is no plugging between casing and pipeline.
The casing shall be fixed firmly and in correct position…
The specification of casing meets the design requirements.
The removable steel pipe box reserved method is adopted, and the materials are waste steel pipes.
pipes passing through the wall, floor or roof shall be embedded with casing.
c.
(4) Leak detection and filling, and perfect plugging.
b.
b.
Embedded quality control of building water supply and drainage and heating works I.
(5) Special personnel shall be assigned to take care of the concrete to ensure that the reserved and embedded holes shall be free of displacement, skew and other phenomena.
The handle made of round steel is easy to pull out after the concrete reaches a certain strength.
[main causes] (1) the pipeline layout in the tube well is not deepened in place.
(2) The cooperation between civil engineering and installation is not in place, and the reserved casing is displaced and omitted during wall construction.