【 Weak current College 】 communication system engineering construction site coordination and control

Construction content overview
Modern communication including multimedia communications, computers, communication networks, personal communication, digital image communications (videophone) and mobile satellite communication, PBX, voice mail and e-mail, etc. In our country, the telephone network is the most basic communication carriers, it automation will reflect on the hardware architecture and software design, such as programmable, can exchange, automatic billing and to form a global network systems. Telephone communication line from gas pipeline outlet boxes, and so on until the user, respectively, as follows:
(1) communication wires introduce (House): through the cable ducts or direct buried from underground gas; through the cable ducts or direct buried, drop by the outer walls; through the aerial cable from exterior House.
(2) PBX room or wiring device:
1) communications cable introduction inside settings user-controlled machine, using the total wiring box or total distribution frame, this room is called the phone room.
2) communication cable introduction estates do not set a user-controlled machine, telephone, gas cable over the transfer box, this room is called the telephone connection.
3) phone room or transfer settings in between to one or two layers, such as a basement and a dry, well-ventilated, consider calling room or call handover between set down in the basement.
(3) vertical cable wearing floor rise pipes, pipe laying along the shaft.
(4) cables laid in the floor horizontal pipeline or cable trunking (tray).
(5) wiring equipment; cable connector box, crossing boxes, junction box, user outlet boxes, communication lines branch, intermediate inspection, terminal equipment.
Construction site coordination points
1. construction and civil engineering structures with
(1) building with basement, drop by the external communication cable to the ground floor, in communication cable entering external location natural flooring-0.8m, embedded with waterstop wing ring of steel casing, General casing pipe diameter greater than 2.
(2) the building without basement, communication cable drop tube can be directly embedded in the wall body concealed, the pipeline can connect to that charge transfer box or out with the back of the line box in the center of embedded cassettes.
(3) pursuant to communication departments design of manhole wells or hand hole shaft geometry size and position size by civil construction drawings, masonry, professional assistance and configure cast iron shaft ring and cast iron manhole cover.
(4) communication cable pipe buried under the natural floor, building 0.8m following apron 1m above.
(5) communication cable lines through the exterior casing, into the human Interior pipe length is not less than 30cm to pipeline connection, ease of construction operations.
(6) communication cable across the Canal and the gaps between the casing, oil, hemp twine for asphalt sealing paste for interior walls, external and both sides should block, and then do the construction facade waterproof treatment.
(7) with the construction of civil structure, Telecom professional builders with embedded floor inside dark piping, dark couplers, crossing the junction box, user outlet boxes, etc.
(8) provide to civil engineering floor type transfer box base base construction drawings, from civil professional assistance to complete the Foundation construction. The base should be not less than C10 concrete production, a height of not less than 20cm. And at the base of the four corner holes 4 root M10× 100 long galvanized bolts to fixed transfer box and in the base of the central reserve communication cable inlet holes.
2. construction and civil engineering outside line with points
(1) direct embedded communication cabling: trench excavation, backfill, leveling, earthwork construction by civil professional assistance, communications professionals meet the construction.
1) civil construction communication lines buried cable, requires that the shop around the cable 50 ~ ·adjustment sand or fine soil, brick and concrete block cover and then backfill.
2) buried cable through roads, pipelines, and should have a spare tube.
3) buried cable line segments each 200 ~ 300m, cable connecting points, branch points, left, direction change Department of cable routing and pipeline intersection, set cable markers.
4) communication cables directly buried into the Interior, buried cable desired approach people building indoor line equipment, exchanging raw lead package cable wear hose introduced. As to the separation line equipment distance within the 15m, armored layer off after wear hose to the line device.
(2) aerial cable laying: aerial cable laying a rod should be timely to construction outside line construction personnel and other professionals outside the pipeline construction personnel understand the communication cable routing, various pipes embedded in the pipeline overlapping, touch, cross, horizontal and vertical spacing does not meet the specification requirements, etc., to be coordinated and soil fertilization. At the same time should note the following:
1) communications cable overhead, is apart from the ground, pavement minimum distance 4.5 ~ 5.5m.
2) communication cables and power cable should not be the same tower erection. Using the same tower erection, its communication overhead cables hanging height and other line spacing should be greater than or equal to 0.6m.
3) adopts hanging lines hanging communication cable, each communication overhead cable capacity is less than or equal to 100 pairs; if a crane line hanging two communication cable, two cables of total capacity of not more than 80 on.
4) communication cable cableway generally use concrete pole, and electric power lines with rod laying out, Rod distance is 35 ~ 45m.
3. and civil engineering construction combined with elements of decoration
(1) PBX room attendant by switch rooms, Hall, room or the UPS batteries (maintenance-free lead-acid batteries) made up of three parts. On civil decoration construction requirements are as follows:
1) switch room floor height is greater than or equal to 3m, if 2.6 ~ 2.9m elevated rack, the height is greater than or equal to 3.5m; floor load low shelf rack, greater than or equal to 450kg/m2, using overhead rack, greater than or equal to 600kg/m2; the ground floor with activities or plastic surface should be anti-static, fire-retardant; light steel joist ceiling or cement-lime mortar plastering, surface coated urea Matt paint, door1.2 ~ 1.5m, aluminum alloy or external opening two door; double window seal is tight, dust, temperature and humidity by setting the control of ventilation and air-conditioning system.
2) operator room floor height is greater than or equal to 3m; floor loads greater than or equal to 300kg/m2; wall cement mortar plastering, surface coating and environment-friendly paint; ceiling with cement mortar plastering, surface coating and environment-friendly paint; doors, Windows should be able to dust; indoor temperature and humidity control by a ventilation and air-conditioning system.
3) battery compartment floor height is greater than or equal to the ground using acid 3m; tiles; floor loads greater than or equal to 600kg/m2; wall plastering cement-lime mortar, acid-resistant surface coating (or alkali) paint; door good dust; the use of double Windows, outer window with frosted glass; indoor temperature is 10 ° c above, and set the ventilation exhaust device.
(2) communication professional construction staff with civil professional activities floor construction. Based construction drawing communication cable routing installation of trunkings, usually in the Cabinet following along the activities under the floor should be as floor following communication cable have difficulty, you can use above the floor laying cable trunkings.
(3) in the laying of trunkings ceiling should be coordinated with other professional trunkings routing is hindered by other pipeline layout, coordination of the various professional pipe pipeline layout elevation and location coordinates, and order by order of procedure.
(4) communication professional builders downlead box (carton), pipeline construction, attention to finished product protection, no casual damage other professional has finished products, semi-finished products for construction, etc.
Construction site control focus
(1) audit communications system construction drawing system diagrams, floor plans, equipment installation, whether by detail drawing and so have the legal qualification of design unit design, confirm construction drawing available before construction.
(2) read construction drawings, you will find a summary of issues central to the design, organization design gives the low-down, put questions to form solution, to be checked to confirm, Wells InCharge design change process.
(3) audit communication system engineering construction organization plan:
1) understand communication system engineering in the engineering, the engineering, construction, control of the construction process and quality control manager.
2) audit communications system construction materials and equipment used for processing orders for planning, workforce scheduling, construction schedule, and so should the General and civil engineering construction schedule, make sure that the total duration of a schedule.
3) communications systems engineering construction technology gives the low-down: communication PABX telephone station building in vertical and horizontal communication cable construction (especially optical cable construction), terminal equipment such as box (carton), etc., on the process requirements, quality management and control requirements, security and protection are all conducted technology gives the low-down.
4) must be provided by the Ministry of posts and telecommunications access national communication network used by PABX, must have network access license issued by the Ministry of posts and telecommunications. Therefore, user selection purchase, be sure to purchase a PTT network access license issued by the program-controlled switches.
5) in order to avoid AC into PBX, burned circuit board, therefore, in the comprehensive wiring system distribution frame and communication access network junction, should be installed with normally open contact of the security element.
6) connection terminals for cables, plates and other major communication equipment electrical performance testing should be sampled. When the relative humidity of 75% with 250V megohmmeter test, cable insulation resistance value should not be less than 200 M Ω; Terminal Board adjacent terminal insulation resistance value should not be less than 500 M Ω.
7) PBX room grounding device can use of common ground. Common ground grid should meet the contact resistance, contact voltage and stepped voltage requirements. Room protection earthing may use three-phase five-wire or single phase three-wire grounding.
8) programmable switch room, in order to reduce the high frequency resistance equipment grounding wire should be laid with copper conductors.
9) PBX room, should be set for general use-DC grounding wire, copper belt for 120mm×0.35mm.
10) when using 200 door following PABX, grounding resistance value should be less than or equal to 5 Ω. When various grounding device adopts joint grounding, grounding resistance value is equal to 1 Ω.