6) Pipeline grounding jumper note: 1.
It is recommended to use common supports for centrally arranged pipelines, and strengthen design optimization and construction planning.
When the length of straight section exceeds 15m or there are more than 3 right angle bends, junction box shall be added.
Construction process: snapping and positioning → processing elbow → concealed laying pipeline → grounding jumper → protective measures 2.
4.
When the reinforcement diameter is 10mm and above, Four bars shall be used as a set of down conductors.
After fabrication, the rust shall be removed and 2 layers of antirust paint shall be applied.
4.
After inserting and positioning, use a set wrench to continuously tighten the set screw until the “neck” is broken to form a whole, and there is no need to make a jumper wire.
The supporting claw lock nut is used at the entry of the grounding wire into the box of the tight set thin-walled steel conduit, and the set screw is screwed off at the pipe connection.
3) Pipeline connection note: butt fusion welding connection of metal conduit is strictly prohibited; Galvanized and steel conduits with wall thickness less than or equal to 2mm shall not be connected by sleeve fusion welding.
2.
There is a PE line in the bathroom, and the local equipotential bonding in the bathroom must be connected with the PE line.
Construction process: drawing opening drawing → opening positioning → technical review → opening forming → casing installation 2.
4.
See the effect drawing: 4.
The bending flatness of the pipeline shall not be greater than 10% of the outer diameter of the pipe, and there shall be no wrinkles, pits, cracks and other phenomena at the bending.
Test points must be set above the ground according to the design requirements for manual grounding devices or grounding devices using building foundation reinforcement.
Method of reserving pipe opening and pipe casing 1.
The welded junction shall be free of slag inclusion, undercut, crack, false welding, air hole and other defects.
The conduit shall be straight into the box and fixed with special lock nut.
5) Local equipotential practice in the bathroom note: 1.
Construction process: making casing → positioning and fixing → technical review → installation and molding 2.
3) Form of supports and hangers: determine the structural form of supports and hangers according to the pipeline laying form in the design and layout drawing, and process and manufacture on site or in factory with reference to the requirements specified in the atlas of indoor pipeline supports and hangers.
Key construction points: the material used for lightning protection and grounding must be hot-dip galvanized products.
Production and installation of pipe supports and hangers 1.
2.
Key points of operation: 1) embedded supports and hangers of iron parts: follow the structure construction, and locate and embed the iron parts according to the coordinates, elevation and spacing of the planned layout drawing; Determine the horizontal elevation of supports and hangers on the embedded iron parts, and weld the fabricated supports and hangers on the embedded iron parts.
5.
See the effect drawing: 1) method of conduit entering the box note: JDG steel pipe is connected with the iron box, and the fixed claw nut is used.
See the effect drawing: 2.
Lightning protection and grounding 1.
Specification of jumper wire table 7) protection method of plastic pipe out of the ground note: when laying plastic pipe, bending shall be reduced.
Key points of operation: firstly, after comprehensive layout planning for various pipes, determine the pipe coordinates, elevation position and direction, draw layout drawing, and construct according to the drawing after being confirmed by the owner, supervisor or design.
The outer wall of welded pipe in masonry shall be painted with anti-corrosion paint.
When the plastic pipe is laid horizontally in the large formwork wall, the spacing between fixed points shall not be greater than 0.5m.
Quality requirements: ensure that the position and size of reserved holes are correct.
2.
Key construction points: Surveying and setting out and positioning according to the construction drawing, coordinates, elevation, direction, and determine the location of junction box, It meets the design requirements after review.
2.
Construction process: embedded positioning of iron parts → fabrication of supports → determination of horizontal elevation and spacing of supports and hangers → installation and fixation of supports and hangers.
See the effect drawing 1) practice of plate reinforcement and pile foundation grounding device 2) conventional practice of using the main reinforcement of vertical structure as lightning protection downlead (according to the design or local regulations) Note: using the main reinforcement of building as concealed downlead: when the reinforcement diameter is 16mm and above, two reinforcement (binding or welding) shall be used as a group of downlead.
There is no PE line in the bathroom, and the local equipotential connection in the bathroom shall not be connected with the outdoor PE line.
2) On site expansion bolt fixed support and hanger: the strength and tension of the selected expansion bolt must ensure that the provisions of the pipeline are firm, safe and reliable; The spacing, elevation and coordinates of supports and hangers shall be determined according to the planning layout.
Quality requirements: the grounding device shall weld and connect the two main structural reinforcements in the bottom plate according to the size and position requirements of the design drawing, and weld with relevant reinforcement (such as pile foundation reinforcement).
The embedded steel conduit shall be grounded.
The pipeline laid in reinforced concrete wall and floor slab shall be bound and fixed close to the inner side of the reinforcement.
Key points of operation: flexible waterproof casing or rigid waterproof casing shall be adopted according to the design, and the material, specification and size of the casing shall be processed and manufactured or purchased on the market according to the requirements of standard atlas of waterproof casing; Bind or weld on the structural reinforcement according to the coordinate dimensions of the layout plan confirmed by the planning.
2.
5) Laying method of tight set pipe note: 1.
3) Test point practice note: 1.
Embedded waterproof casing 1.
500mm from the ground when there is no design requirement.
1.
Quality requirements: the of all casings shall be flush with the wall, and the one out of the floor shall be 20mm higher than the floor finish, (the toilet and pipe well shall be 50mm) 4.
The grounding resistance value of the test grounding device must meet the design requirements.
The fabrication and welding shall be firm, the welds shall be full and beautiful, the installation and fixation shall be firm, and the spacing shall meet the requirements.
3.
4) Practice of power supply inlet pipe note: 1.
3、 Conductors shall be reserved at 0.8m ~ 1m below the outdoor floor and attached with artificial grounding body.
2) Note: 1.
4) Practice of reserved points for equipotential bonding of metal steel windows (bridging with windows shall be completed by professional companies).
3.
See the effect drawing 3.
Note: the metal frames of curtain walls and metal doors and windows of buildings required to be grounded in the design shall be reliably connected with the grounding trunk line nearby, and anti electrochemical corrosion measures shall be taken between different metals at the connection.
2.
Construction process: construction preparation → grounding device installation → down lead → equipotential connection 2.
Method of welding steel pipes 1.
The galvanized steel pipe grounding wire adopts the grounding wire clamp jumper method; 3.
3.
The grounding wire of ordinary steel conduit adopts cross welding method; 2.
Quality requirements: steel pipes below sc25 shall be bent with supporting pipe bender, and pipes above sc32 can be bent with pipe bender or hot simmer method.
For special supports and hangers or supports and hangers outside the atlas, they shall be calculated and rechecked, and made of qualified section steel to ensure that the supports and hangers are firm, safe and reliable.
The wall entry pipe of directly buried cable must be waterproof, and its buried depth shall not be less than 700mm away from the outdoor surface, with waterproof slope (5p0p ~ 10p0p).
The jumper wire of galvanized steel pipe or flexible metal wire protection pipe shall be jumper connected with grounding wire clamp, and shall not be connected by fusion welding.
6) Seal with temporary cover plate to prevent pollution (other boxes shall also be protected according to this method)..
Wear the belt wire in time, and effectively block the pipe orifice, box orifice and box orifice.
Quality requirements: the material, specification, model and structural form of the supports and hangers must meet the requirements.
When laying in a straight line, the spacing of fixed points shall not be greater than 1m.
3.
4.
For concealed conduits, the distance between the buried depth and the surface of buildings and structures shall not be less than 15mm, and the clear distance between conduits used for fire-fighting facilities shall not be less than 30mm.
Concealed inspection records shall be made for concealed laid equipotential bonding wires and their connections, and their actual direction and position shall be indicated on the as built drawing.
3.
