1.1 Standards for the use of materials
(1) Hydropower pipes: The brand and specifications of the materials should meet the requirements of the contract, and the wall thickness and material properties should meet the specifications and design requirements.
(2) Wire and cable: wire and cable related testing data, core section size, conductivity coefficient meet the specifications and design requirements.
1.2 Engineering quality standards
(1) Measured and measured standards
The distance between the holes of the reserved drain pipe of the toilet is [0,15]mm
同一室内底盒标高差 ≤10mm
The elevation difference between the same indoor panel/socket ≤ 5mm
(2) Deliver visual quality standards
The walkie-talkie intercom function is abnormal, the visual function is abnormal, the key unlocking function is abnormal, and the surface is damaged and polluted
The arming and fortification test of the security system is normal, and there is no damage or pollution on the surface of the security equipment
Indoor distribution box: the switch function is normal, the corresponding control circuit is clearly marked, the actual correspondence is accurate, the control box is installed horizontally, and the surface is not damaged and polluted
Floor heating/radiator: flexible opening and closing, smooth pipe root closure, and proper radiator installation
Switch: There is no damage, pollution and scratch on the surface, smooth opening and closing, correct corresponding control terminal, correct switch/panel installation, and no rough closing
Socket: the phase sequence test is correct (left zero and right phase, grounding is on the top), the short-circuit protection test is normal, and there is no pollution, damage and rough closing on the surface
Lighting: The lighting of the lamp position is energized normally
1.3 Engineering Standard Practices
(1) Reserve pre-embedded
The depth and width of the embedded wall of the wire and pipe should meet the requirements, and the pipe should be filled with mortar or fine stone concrete after installation, and the surface plastering layer should be hung with steel wire mesh (specification 10*10*0.7mm). (See Figure 1)
Figure 1 Mechanical cutting and grooving of the wall
The water supply pipes and electrical pipes of the small hollow block wall can be sleeved into the hollow hole or embedded in the hollow hole of the block after slotting.
Wire box embedding: When two wire boxes are used side by side, the distance between the wire boxes is controlled at 1.0mm, or the connecting box is used to avoid a large exposed gap in the middle after the socket and switch panel are installed; Two, three, or more sockets and switch panels on the same wall should be installed on the same horizontal or vertical line.
It is recommended not to bury the wire box for the roof lighting of the toilet and balcony, and directly embed the wire pipe to prevent water leakage at the wire box. (See Figure 2)
Figure 2 Toilet roof embedded conduit
When the pipe passes through the roof, the casing must be set, and the casing must be laid out on the formwork and firmly fixed before pouring. The upper mouth of the casing is not less than 50mm above the finished surface, and for small diameter pipes, the casing diameter should be two sizes larger than the pipe diameter. For large diameter pipes, the casing diameter should be greater than the outer diameter of the pipe by 50mm.
When the width of the distribution box exceeds 500mm, the top of the concrete lintel should be installed, and when the width of the distribution box exceeds 300mm, the reinforced brick lintel should be set at the top, and 3 Ф6 steel bars are used to prevent the box from being deformed under compression.
(2) Bathroom through the wall water pipe
Toilet water supply pipes are reversed: Bathroom water supply pipes must not be directly penetrated into the bathroom from the threshold or along the root of the ground wall. The following options are available
1) The toilet water supply pipe is 200mm back on the façade of the reverse ridge and is worn from the masonry wall;
2) The toilet wears the anti-hurdle water supply pipe and buries it for a distance along the direction of the anti-hurdle and then goes up and back to the masonry wall, does not directly pass through the anti-hurdle, and the buried position of the water supply pipe should be controlled (the elbow part should be in the middle of the cross-section distance of the anti-kan), and the through-leakage point shall not be formed in the anti-ridge. (See Figure 3)
Figure 3 The toilet water supply pipe is connected from the concrete back
The water pipe can only be buried along the concrete reverse ridge pre-embedded pipe groove or slotted, and cannot be laid on the bathroom floor, and the drainage pipe cannot be fixed by punching holes in the ceiling. The water supply pipes of the bathroom and kitchen must be concealed, and try to walk in the wall, and the water supply pipe of the bathroom is not allowed to go to the ground.
Pipe root plugging: In order to prevent leakage, pipe hole plugging should be carried out in two times with fine stone concrete, and 20mm groove should be left after the second plugging. After passing the closed water inspection, the waterproof construction around the pipeline can begin.
The secondary plugging of the drainage riser opening should be supported by the formwork, and the wire hanging mold cannot be used. It is recommended to use the finished hanging hole mold, and select the plugging and shaping mold according to the pipe diameter and the size of the reserved hole for pipe hole plugging. (See Figure 4, Figure 5)
Fig. 4 The finished hanging hole mold is used to plug the pipe plug
Figure 5 Pipe plugging fixture
Encapsulated pipeline: After the installation of the toilet drainage riser, it is required to do a good job of fine stone concrete mulching, with a height of 200mm protruding from the ground (with the required height of the caisson protruding from the caisson structural surface of 250mm), and the masonry of the toilet drainage riser should be built on the concrete mulch or concrete anti-ridge when the toilet is encapsulated, and the junction of the brick wall of the tube well and the toilet must be hung with steel wire mesh, and the masonry of the tube well and the bathroom wall shall be plastered together after the masonry is completed. (See Figure 6)
Figure 6 Vertical riser encapsulation in the bathroom
(3) Wear exterior wall air conditioning pipes
When the exterior wall is masonry, it is not advisable to directly open the air conditioning pipe hole on the masonry wall, it is recommended to use precast concrete blocks instead of blocks, and the casing must be embedded when the prefabricated concrete blocks are prefabricated, and the casing is high inside and low outside to avoid reverse slope. For small diameter pipes, the casing diameter should be two sizes larger than the pipe, the large diameter pipe casing should be 50mm larger than the pipe diameter, and the pipe interface should not be located in the casing; the gap between the casing and the pipe should be densely filled with flexible flame retardant materials, and the flexible filler can be filled with polyurethane foam or asbestos rope. (See Fig. 7, Fig. 8)
Figure 7 Installation of prefabricated air-conditioned concrete blocks
Figure 8 Prefabricated air conditioning concrete block size
When the exterior wall is a concrete structure, the PVC casing of DN80 is embedded during the construction of the main structure to avoid later drilling. The surface of the PVC pipe should be sandpaper, the two ends of the PVC pipe must be level with the wall, the height difference between the inside and outside is 20mm, and the slope should be set according to the principle of inner height and outer low. When there is external insulation or the veneer is too thick, it is necessary to use a smaller casing to connect the embedded casing with the face or insulation layer before the insulation or finishing construction, and the external insulation and PVC pipe are tightly sealed and plugged by styrofoam.
1.4 Project Prohibition Practices
(1) No mechanical cutting is used, and the trunking is directly chiseled on the masonry wall
Description of prohibited practices: Directly chiseling the trunking on the masonry wall, destroying the overall stability of the masonry wall, and the plastering is prone to cracking in the later stage.
(2) The water supply pipe is directly penetrated from the root of the waterproof anti-ridge or the sill under the door
Problem description: The water supply pipe is directly through the waterproof anti-ridge root or the sill under the door, forming a through leakage channel, resulting in leakage.
(3) The opening of the pipeline through the floor slab is not in place due to the formwork support, resulting in the concrete pouring is not compact; the toilet water supply and drainage pipes are perforated and fixed on the ground and the ceiling, resulting in leakage
Description of prohibited practices: The drainage riser opening template is not firmly supported and blocked, resulting in poor concrete pouring. In addition, if the formwork is fixed with iron wire, it is easy to leak when the iron wire is corroded.
Prohibition Problem description: The water supply pipe is laid along the waterproof floor of the toilet and nailed and fixed, or the drainage water pipe is laid along the bathroom ceiling and nailed to fix the hanging code, causing leakage.
(4) The switch and socket panel is uneven and the panel is leaking
Prohibition Problem description: The switch and socket panel is uneven, the panel is not plastered around the edge, and the seams are exposed
(5) Lack of planning and uncoordinated mechanical and electrical installation in public areas
Description of prohibited practices: A number of construction units are constructed separately, downlights and switches are constructed by the installation unit, and fire-fighting equipment is constructed by the fire-fighting unit.
Description of prohibited practices: The fire box in the front room of the elevator is not installed in the wall, obstructing the passage space.
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