Building water and electricity pre-embedded construction technology (summary)
Pre-embedded refers to the components that are pre-embedded in the decoration design before the concrete is poured. Here are some building water and electricity pre-embedded components. Key points of buried construction technology, I hope it will be helpful to everyone!
1. Materials
Water and electricity installation materials are divided into main materials and auxiliary materials, which are supplied The methods include supply A, supply A and supply B and supply B; materials supplied by A are generally: wires, cables, PVC electrical casing and accessories, bridges, distribution boxes, water supply pipes and fittings, drainage pipes and fittings, submersible sewage pumps, valves, etc. etc.; the materials supplied by A and B generally include: switches, sockets, lamps, steel and plastic pipes, galvanized steel pipes and pipe fittings, welded steel pipes and pipe fittings; most of the materials supplied by B are auxiliary materials.
The following aspects should be paid attention to in terms of material control:
1. Before the materials arrive
(1) Understand the procedures for placing orders for various A-supplied materials When it comes to the delivery cycle, please declare the supply materials in advance according to the process. Generally, wires, cables, bridges, and submersible sewage pumps need to be declared one month in advance, and others must be declared at least 10 days in advance;
(2) Before making a material supply application form and supply notice, be sure to make a team material application form and have the team sign it to avoid subsequent disputes; at the same time, check the quantity of materials and check whether the specifications and models of the materials are It is consistent with the blueprint. Remember not to use the electronic version of the drawing to check the materials, because the electronic version of the drawing may be partially different from the blueprint;
(3) When making a supply material application form and supply notice , be sure to check carefully whether the date, supplier name, construction unit name, material name, specification model, quantity and other information are correct;
(4) Before arrival, call to confirm the arrival of the goods. The maximum time and unloading location, try to avoid arrival during off-duty hours;
(5) Print a copy of the supply notice to facilitate on-site verification whether the materials arriving are consistent with the currency notice;
2. Materials arrive
(1) After bringing the materials to the unloading location, check whether the material acceptance form is consistent with the supply notice, check whether the certificate and test report are complete, and then Notify Party A and the supervisor for acceptance;
(2) After passing the acceptance, notify the team to unload the goods, check the materials on site, and hand over the materials to the team for use. During the unloading process, it is also necessary to check whether the materials are damaged or damaged. Missing components, scratches, etc.;
(3) Check the quantity of material accessories (such as screws, bridge covers, etc.) to avoid insufficient ones later. If they need to be assembled, check whether the specifications and sizes are consistent;
(4) After the quantity is confirmed and handed over to the team for use, the team needs to sign for confirmation;
3. After signing for the materials
(1) Sign the material acceptance form When checking the material acceptance form, check the following information on the material acceptance form:
The information on the material acceptance form must be carefully confirmed and checked, including plot, building number, date, etc.;
Check whether the supplier unit Sign, check whether the date is the same day, and check whether the handwriting on the acceptance form is clear;
When accepting materials, the name, specification, model, quantity and usage part of the material must be correct;
(2) After the material acceptance form is signed, make a material distribution form and have the team sign it. The material accessories must be clearly noted on the distribution form to avoid disputes.
(3) Supervise the team to keep the materials, and not to pile them up randomly, and not to expose some materials to the wind and sun;
2. Pre-embedded construction
1. Pre-embedding the basement floor
(1) Work content: welding of grounding body and grounding trunk lines, pre-embedding evacuation indicator light pipes, pre-embedding drainage pipes, pre-embedding civil air defense pipes, and power supply for submersible sewage pumps Pre-buried line pipes and pre-buried submersible sewage pump outlet pipes;
(2) Common problems and solutions:
1) Welding of grounding bodies and grounding trunk lines:
① Problem: The two steel bars of the grounding body are not welded to the two diagonal steel bars of the pile foundation (mostly bridging), or are not connected to the down conductor;
Solution: Grounding When welding the whole body, follow-up inspections are carried out and on-site rectification is carried out for any discrepancies;
② Problem: During the welding process, the overlap length does not meet the requirements, or there is incomplete welding, weak welding, and welding slag has not been removed. etc.; According to the Construction Quality Acceptance Code for Building Electrical Engineering 24.2.1, lap welding should be used for welding of grounding devices, and the lap length should comply with the following regulations: The overlap between flat steel and flat steel shall be 2 times the width of the flat steel, no less than Welding is performed on three sides; the overlap between round steel and round steel is 6 times the diameter of the round steel, and welding is performed on both sides; the overlap between round steel and flat steel is 6 times the diameter of the round steel, and welding is performed on both sides; flat steel and steel pipes are welded on both sides. The steel and angle steel are welded, close to the outer sides of the angle steel, or close to the surface of 3/4 of the steel pipe, and welded on the upper and lower sides; except for the welded joints buried in concrete, there are anti-corrosion measures.
Solution: Before welding, inform the workers, and conduct follow-up inspections when welding the ground body;
2) Pre-embed the evacuation indicator light conduit:
① Problem: After the basement floor is poured, the JDG pipe is exposed at the column position;
Solution: When pre-embedding, it is required to bury the JDG pipe under the gluten; for the exposed pipe , carry out groove cutting and concealed laying treatment;
(3) Other points to note:
① The welding of the grounding body and grounding trunk line must be completed after the laying of the bottom plate steel bars and before the concrete pouring; < /p>
② When embedding the evacuation indicator light, pay attention to the direction, that is, which side of the column is embedded;
③ The civil air defense drainage pipe of the basement floor and the drainage pipe of the elevator foundation pit are multi-purpose Galvanized steel pipes, galvanized steel pipes must not be welded;
④ The submersible sewage pump pipe must be pre-buried in the bottom plate. If it is hidden in the bottom plate leveling layer, it may cause the sump cover to be unable to be installed. ;