Biện pháp an toàn trên công trường. Dự án SunWah (english)

Description of Compilation
The “Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects” (Illustrations) is compiled in accordance with relevant laws,
regulations, standards and specifications of China as well as related stipulations of countries and regions where CSCEC has been carrying out
business operations, combining with China’s construction safety management system and actual situations on site. The compilation is done to
implement CSCEC’s safety concept of “Life First and Safety First” and realize normalization and standardization of safety facilities on construction sites.
I. Principles and Requirements of Compilation
1. The compilation is done complying with laws, regulations and standards of the state, based on which, we strive to make it simple, practical,
easily kept, well circulated and instrumentalized.
2. The compilation, taking full account of geographical differences, has classified the Illustrations into such three parts as Basic Protection,
Standard Protection and Upgraded Protection. The Basic Protection is the bottom line, followed by the Standard Protection to be popularized and
the Upgraded Protection to be recommended. The Upgraded Protection is the relevant addition of the Standard Protection.
3. The standard or standards of the host countries, if higher than the Illustrations, shall be applied.
4. The materials included in the Illustrations for undertaking protections shall have to meet the specifications in terms of rigidity, thickness and
side impacting force.
5. The Illustrations includes the most basic site protections other than those uncovered protections which shall be done in line with “Illustrated
Standards for Safety Protection on Construction Sites of CSCEC’s Projects” (2014 edition).
6. The Illustrations shall be implemented from the date of its issuance.
II. Basis of Compilation
Law of the People’s Republic of China on Safety Production
Safety Management Measures for the Safety Management of Large and Dangerous Parts of Projects
Provisions of Safety Supervision and Administration on Construction Lifting Appliances
Standard for Construction Safety Inspection


Technical Code for Safety of Temporary Electrification on the Construction Site
Technical Code for Safety of Working at Height of Building Construction
Technical Code for Safety of Steel Tubular Scaffold with Couplers in Construction
Technical Code for Safety of Implementation Scaffold Practice in Construction
Technical Code of Temporary Building of Construction Site
Technical Code for Fire Safety of Construction Site

Related Management Rules for Safety Production of CSCEC

The Compilation Committee
September 2017


Basic Protection


Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

Table of Contents
1. Protection of Height Operations
1.1 Protection of Edge
1.1.1 Protection of Foundation Pit Edge........................2
1.1.2 Protection of Floor, Balcony and Roof Edge........3
1.1.3 Protection of Stairway Edge..................................4
1.1.4 Protection of Operation Line Edge........................5
1.2 Protection of Hole
1.2.1 Protection of Reserved Hole.................................6
1.2.2 Protection of Elevator Shaft..................................7
1.2.3 Protection of Post-cast Strip..................................9
1.3 Protection of Passageway.......................................10
1.4 Movable Operating Platform..................................11
1.5 Overhanging Discharge Platform...........................12
1.6 Radius Protection of Falling Object from Main
Structure......................................................................14
2. Scaffold
2.1 Floor-standing Scaffold.........................................15
2.2 Overhanging Scaffold...........................................17

2.3 Wall Connecting Fitting........................................18
2.4 Ramp.....................................................................19



3.Others
3.1 Protection of External Electric Power........................20
3.2 Protection of Distribution Box...................................21
3.3 Protection Shed of Processing Plant..........................22
3.4 Protective Hood for Machinery..................................23




Life First, Safety First

covered with fine mesh net

steel pipe

rail

bottom horizontal tube

upright tube

skirting width 200
Caution colors

1.1.1.1 Diagram of Foundation Pit Edge Protection

1.1.1.2 Elevation of Foundation Pit Edge Protection Unit:mm

ORSH
LQDJHV
•GUD

skirting

Notes

safety net
drainage

1. Protection of foundation pit edges shall be done as shown above.
2. Protective railings shall be installed fine mesh safety vertical net inside
and 200mm skirting board outside, painted with red and white and black
and yellow colors.
3. Drainage ditch shall be made outside the protective railings.
4. Warning signs shall be hung outside the protective railings.
5. Warning lights shall be set up on the protective railings for night operations.

1.1.1.3 Side Elevation of Foundation Pit Edge Protection

Unit: mm

1.1.1 Protection of Height Operations-Edge Protection
Protection of Foundation Pit Edge

Illus. 1.1.1.1~1.1.1.3




Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

1200(When slope is larger than 1:2.2, it shall be 1500)

Floor N+1

Floor N

1.1.2 Diagram of Edge Protection for Floor, Balcony and Roof

Unit mm

Notes
1. Protective railings for floor, balcony and roof edges shall be of steel pipes with fasteners as shown in drawing1.1.2.
2. Spacing of upright tubes shall not be larger than 2000mm, with 200mm skirting boards.
3. Fine mesh safety vertical net shall be installed inside the protective railings

1.1.2 Protection of Height Operations-Edge Protection

4. Warning lights shall be set at special locations.
Protection of Floor, Balcony & Roof Edge



Illus. 1.1.2

Life First, Safety First

ĭ
VWHHOSLSH

rail
rail

upright rail

1.1.3.2 Upright Tube Detail of Stair Edge Protection Unit mm
padded base

1.1.3.1 Elevation of Stairway Edge Protection Unit mm

Notes
7KHSURWHFWLRQVKDOOEHGRQHXVLQJɎ
PPVWHHOSLSHZLWKIDVWHQHUV
1.1.3 Protection of Height Operations-Edge Protection

2. Spacing of upright tubes shall not be larger than 2000mm.
3. Fine mesh safety vertical net shall be installled inside the protective railings.

Protection of Stairway Edge

Illus. 1.1.3.1~1.1.3.2



Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

Wing nut

Wing nut
Upright tube

0KLJKVWUHQJWKEROW

Disk-extrudingg

5mm steel plate rib

Bolted base

1.1.4.1 Detail of Screw Extruding Edge Protective Upright Tubes Unit mm

1.1.4.2 Detail of Disk Extruding Edge Protective Upright Tubes Unit mm

Notes
1. The screw extruding edge protective railings and upright tubes shall be as shown in the drawings. Three
M16 high strength bolts shall be fixed onto the steel pipes at the bottom, with the spacing of upright tubes not
exceeding 2m. On the top connect the railings or hang the life ropes for protection.
2. The disk extruding edge protective railings and upright tubes shall be as shown in the drawings. After the
formworks are set up, the protective railings shall be clipped onto the form board and the batten. The spacing
of the upright tubes shall not exceed 2m. The protection on the top can be conducted by connecting the rails or
hanging life ropes.


1.1.4 Protection of Height Operations-Edge Protection
Protection of Operation Line Edge

Illus. 1.1.4.1~1.1.4.2


Life First, Safety First

toeboard
rail post

flat net

rail

side rope
to be bound on to
bottom tube
rail

rail post

protective railing

1.2.1.1 Diagram of Reserved Hole Protection
Notes
1. The opening with the short-edge size smaller than 250mm but bigger than 25mm on the surface of floor slab, roof and
platform shall have to be covered with solid cover plate. The cover plate shall be well fixed.
2. For holes on the floor slab surface with the length of sides of 250mm–500mm, holes for installing precast units, and
holes temporarily formed, the cover plates made of bamboo and wood shall be used to cover the holes. The cover plate

shall be well balanced and shall undergo rigid positioning.
3. For holes with the length of the sides of 500mm-1500mm, the steel pipe mesh composed of steel pipes and fasteners
shall be prepared with the mesh spacing not bigger than 250mm. The scaffold boards shall be fully laid on the top.
4. For holes with the length of the sides over 1500mm: 1) For main structure construction, the #-shaped platform
comprised of steel pipes and fasteners shall be built on the holes. The platform shall be laid hard materials (bamboo
springboard or square wood form board) for protection. Around the holes install protective railings in double rows. (The
lower railing shall be 600mm and under from the ground and the upper railing shall be 1100mm from the ground, with
the upright tube being 1200mm in height.). Outside the railings hung “Beware of Falling down” warning signs. 2) For
installation and fitting-out works, protective railings in triple rows shall be installed around the holes (The lower railing
shall be 100mm from the ground, the middle railing 500mm from the ground and the upper railing 1100mm from the
ground, with the upright tube being 1200mm in height.). Safety flat net shall be set down the holes and outside the
railings hung “Beware of Falling down” warning sign. 3) The protective railings shall be at least 200mm from the edges
of the holes. 4) The railings shall be brushed warning color paint.
5. The cover plate used for the holes with the length of the sides smaller than 500mm shall bear the load of 1KN/m2. For
holes by the vehicle roads, deep ditches, pipeline pits or channels, the cover plates used shall bear the load equaling to
double times and more of the locally rated effective loading capacity of back wheels of trucks.
6. For vertical holes of window sills whose lower edges being under 800mm from the floor slab and ground, temporary
railings with the height of 1.2m shall be added if the side edge head is bigger than 2m.

up rail

fine mesh net

rail post

safety net

down rail
batten
skirting width 200, with caution

colored paint @150

side length larger than 1500

Yellow/black paint
Yfull scaffold board

side length smaller than 500

rebar two-way welded
wooden board laid
on rebar net

steel pipe

Yellow/black paint
full scaffold board
steel pipe

side length 500-1500

side length 500-1500

1.2.1.2 Detail of Horizantal Hole Unit mm

1.2.1 Protection of Height Operations-Hole Protection
Protection of Reserved Hole

Illus. 1.2.1.1~1.2.1.2




Illustrated Standards for Safety Protection on Construction Sites of CSCEC's Overseas Projects

expansion bolt

5mm iron sheet

iron fence gate

10mm steel plat

spacing
skirting
board
spacing
200 skirting
board

1.2.2.1 Elevation of Protective Door for Elevator Shaft Unit

mm

1.2.2.2 Node Detail of Protective Door for Elevator Shaft

Unit

mm

Notes
1. The protective door for elevator shaft shall be of welded section steel with the
required strength. The height shall be not less than 1500mm.
2. The bottom of the protective door shall be installed 200mm high skirting boards.
3. The protective door and skirting boards shall be brushed red and white or black and
yellow caution paint.
4. The “Watch out for Falling and No Throwing Objects” signs shall be hung outside
the protective door.

1.2.2 Protection of Height Operations-Hole Protection
Protection of Elevator Shaft



Illus. 1.2.2.1~1.2.2.2


Life First, Safety First

rigid spacer

steel wire rope

2 clips

springboard or
form board
protective door
steel pipe

safety net

steel pipe
steel pipe

bolt hole through wall

hard segregation

flat net soft segregation

1.2.2.3 Diagram of Elevator Shaft of

1.2.2.4 Diagram of Elevator Shaft Safety

Horizantal Hard Segregation

Level Net Soft Segregation
hard segregation, initialfl

Notes
1. Horizontal hard segregation: The steel pipe shall be set up through the wall. Two
SLHFHVRIɎ
PPVWHHOSLSHVJRWKURXJKWKHUHVHUYHGKROHVZLWKWKHSLSHHQGV
fixed with fasteners. Scaffold boards or form boards shall be fully laid.
2. Safety flat net soft segregation: tying with steel wire ropes (at the reserved holes or
bolts through walls) shall be conducted every other floor (not longer than 10m), with

1.2.2.5 Elevation of Elevator Shaft Horizantal Protection

the horizontal safety net hung up.
1.2.2 Protection of Height Operations-Hole Protection
Protection of Elevator Shaft

Illus. 1.2.2.3~1.2.2.5



Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

level covering with bamboo board

water retaining bank

wood brace

1.2.3 Diagram of Post-cast Strip Protection

Notes:
1. The post-cast strip shall be sealed and segregated with bamboo boards.
2. The two sides shall have water retaining banks.
1.2.3 Protection of Height Operations-Hole Protection
Edge Protection of Post-cast Strip


Illus. 1.2.3


Life First, Safety First

double-layer wood springboard protection
double-layer wood springboard protection
steel pipe

Safety Passage
upright tube

1.3.1 Front Elevation of Safety Passageway Protective Shed Unit

mm

1.3.2 Side Elevation of Safety Passageway Protective Shed

Unit

mm

Notes:
1. The main building entrance shall have safety passageway protective shed made of steel pipes and
fasteners.
2. The width and length of the protective shed shall be determined based on the height of buildings.
For buildings under 24m, the length of the passageway shall be
buildings over 24m, the length of the passageway shall be

3m, and the width

2m. For

6m, and the width be

3m. The

length of the shed shall be counted from the external upright tubes of the external scaffoldings.
3. The protective shed shall be in double layers with the spacing of 600mm. The top can be of 50mm
wooden board or other materials having the strength of a 50mm wooden board. The safety passageway shall be sealed on the two sides and the top with form board, and be hung caution signs.

1.3 Protection of Height Operations
Protection of Passageway

Illus. 1.3.1~1.3.2



Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

protective rail

Notes:
1. The operating platform shall have the area not exceeding 10 , the height not exceed-

scaffold board

ing 5.0m and the load-bearing capacity not exceeding 1.5KN/ . Stability calculation
shall also be made.
secondary beam

2. The wheels of movable operating platform shall be firmly and securely joined with
the platform. The distance of the upright tubes’ bottom from the ground shall not exceed
80mm. The brakes of the wheel shall be workable while the platform is in operation.
Inclined bracing shall also be made around the platform.

3. The operating platform shall be established with 48.3x3.6mm steel pipes with fasten-

ladder

ers. It can also be fabricated with gantry or socket and spigot steel pipe scaffolds. Spacing of secondary beams of platform shall not be larger than 400mm. The operation
surface shall be fully laid with scaffold boards.
4. The operating platform shall be installed protective railings all around according to
edge operation requirement, and be built climbing ladders
5. The movable operating platform shall be hung weight limit and inspection IDs.
6. The access on the platform shall have anti-falling measures.
1.4 Diagram of Movable Operating Platform Unit

mm

1.4 Protection of Height Operations
Movable Operating Platform


Illus. 1.4


Life First, Safety First

EXLOWLQĭURXQGEDU

external frame
ĭZLUHURSH
DWOHDVWFOLSVIRUHDFKURSH

DQJOHVWHHO


wood wedge, laterally wedged up

wood fence

SLHFHVRI+5%EDUVPĭ

EXLOWLQĭURXQGEDU

,VKDSHVWHHO
welded I- steel to avoid sliding to structure

1.5.1 Side Elevation of Overhanging Discharging Platform

Unit

mm

1.5.2 Structural Diagram of U-shape Bolt Fixing Overhanging Steel Beam Unit

mm

Notes
1. The overhanging discharging platform shall have special plan.
2. The main frame for the discharging platform shall be of I-beam. The main overhanging beam shall be I-beam not smaller than #18. Two
cable-stayed steel wire ropes shall be set separately on the two sides.
7KHVL]HRIWKHURSHVVKDOOVXEMHFWWRWKHFDOFXODWLQJUHVXOWQRWEHVPDOOHUWKDQĭPP7KHLQWHUVHFWLRQDQJOHEHWZHHQWKHFDEOHVWD\HGVWHHO
wire rope and the platform shall be bigger than 45º.
4. Protective railings shall be installed all around the platform which shall also be fully enclosed. The bottom of the platform shall be fully laid
scaffold boards or riffled plate.

5. The inside of the discharging platform shall be hung weight limit and inspection IDs.

1.5 Protection of Height Operations
Overhanging Discharge Platform

Illus.1.5.1-1.5.2



Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

1.5.3 Diagram of Steel Wire Rope Clamp

1.5.4 Table of Quantities of Steel Wire Rope Clamp

Notes
1. Spacing of rope clamps shall be as shown in Diagram 1.5.3.
2. Numbers of clamps shall be based on diameter of steel wire rope as shown in Table 1.5.4.
3. The rope clamps shall be set in one line with U-shape loop on the rope end and binder plate on the main rope.

1.5 Protection of Height Operations
Overhanging Discharge Platform


Illus. 1.5.3~1.5.4


Life First, Safety First

anti-falling measure

building

falling radius based on building height

safety passage

falling radius

loop road

safety passage
radius protective railing

segregation

road

1.6.1 Plan of Object Falling Radius Protection of Main Structure
1.6.2 Effect Picture of Object Falling Radius Protection of Main Structure

Notes:
Operating Height/m

1. For the main structure construction at heights, protective measures shall be taken and warning
lights be turned on at night.

Classification

2. The scaffolds shall be hung flat net guarding against falling objects. Such double protections
shall be given as fine mesh safety vertical net and flat net, fixed with fasteners. The upper steel

A Risk-free Factor
B Risk Factor

wire ropes shall be securely tied to the main structure.

C Falling Radius

3. The object falling radius shall be as per specification for operation at heights as shown in
Table 1.6.3. Protective railings shall be installed around the radius, with the method similar with

1.6.3 Table of Grading of Height Operations

Edge Protection as shown in Drawing 1.1.1.1.
4. The access of object falling radius shall be prepared with safety passageway with the method
same as Safety Passageway as shown in Drawing 1.3.1.

1.6 Protection of Height Operations
Radius Protection of Falling Object
from Main Structure

Illus. 1.6.1~1.6.3



Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

scaffold rail
building

fine mesh net
net for next floor

scaffold upright

(installed not more than 10m from
initial net; last net under eave)

upright added at exposed corner

initial net (flat) installed on 1st floor top

2.1.2 Diagram of Floor Stand Scaffolds at External Exposed Corners
2.1
2.
1..2
2.1.2

scaffold board

upright tube with steel base
SDGGHGZLWK"ERDUG
bottom tube
GUDLQDJHGLWFK


Note )RUEXLOGLQJVXQGHUIORRUVVHWVRIIODWQHWVKDOOEHLQVWDOOHG
(i.e. initial, middle and eave). For high-rises, the above drawing shall be applied.

2.1.1 Diagram of Horizantal Protection of Floor Stand Scaffold

Unit: mm

2.1.3 Effect Picture of Corners

2.1 Scaffold
Floor-standing


Illus. 2.1.1~2.1.3


Life First, Safety First

swivel coupler
swivel coupler

2.1.4 Diagram of Diagonal Bracing under 24m in Height

2.1.5 Diagram of Diagonal Bracing over 24m in Height

Notes:
1. The internal face of the scaffolds shall be fully covered with fine mesh safety vertical net.
2. The number of shear supports for scaffold crossing the upright tubes shall be as shown in Table 2.1.7
with the overlapping length of the support not less than 1m, and with at least 3 fasteners. The distance
between the edge of fastener cover and the upright tube shall be more than 100mm. The surface of the
shear supports shall be painted caution colors.
3. For single or double rows of scaffolds with the height under 24m, one row of shear supports shall be
installed continuously from bottom to the top on the two ends, around the corner and at the face with
the interval not exceeding 15m.

4. For double rows of scaffolds with the height over 24m, shear supports shall be fully and continuously
set up on the outside.
5. The scaffold fasteners to wall shall be set closer to the main joints, with the deviation not bigger than
300mm. For double rows of scaffolds with the height over 24m, rigid fasteners shall be securely fixed
to the building structure. The two ends of open-type scaffolds shall have wall fasteners whose vertical
spacing shall be not larger than building floors, and not bigger than 4m.
6. The bottom and operation layers of the scaffolds shall undergo hard and horizontal treatment for
protection, i.e. 4 steps of hard and 2 steps of soft treatment.
7. The upright tubes, padded with 5mm iron plate and scaffold board, shall be firmly installed on the
concrete base ground.
8. The bottom of the scaffolds shall have drainage ditch.

2.1.6 Diagram of Diagonal Bracing Lap Mode Unit: mm

'LS$QJOHĮEHWZHHQ'LDJRQDO
Bracing Railing and Ground

q

q

q

Max. Quantities of Diagonal
Bracing Cross Railings n







2.1.7 Table of Maximum Quanitites of Cross
Railings of Diagonal Bracing

2.1 Scaffold

Floor-standing

Illus. 2.1.4~2.1.7



Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

wedged up

2.2.1 Effect Picture of Overhanging Scaffold
2.2.2 Structural Diagram of Cantilever Steel
DQJOHVWHHO


wood wedge, laterally wedged up

Beam through Walls Unit
2.2.2

mm
mm

SLHFHVRIVWHHOEDUVORQJĭ

2.2.3 Structural Diagram of U-shape
Anchor Bolting Unit

2.2.4 Structural Diagram of Cantilever Steel Beam Floor Unit: mm

mm

Notes
1. The one-time overhanging height of scaffolds shall not exceed 20m. The section steel of dual-axisymmetrical across-section shall be used for section steel cantilever beams.
2. The U-shaped steel bar pull ring or anchor bolt for anchored cantilever beam shall have the diameter not
less than 16mm, preferably cold rolled. The gaps between the U-shaped steel bar pull ring, anchor bolt and
section steel shall be wedged with steel wedge or hard wood wedge.
3. The outer end of every section steel cantilever beam shall be diagonally tied to the building structure on
the above floor with steel wire ropes or steel tie rods.
4. The built-in section of the cantilever beam shall be at least 1.25 times longer than the overhanging section.
The built-in section steel cantilever beam shall be fixed to the steel structure beam slab with over 2 U-shaped
steel bar pull rings or anchor bolts.
5. When the beam is anchored to the floor slab, the floor slab shall have the thickness of not less than 120mm.
If the slab is less than 120mm in thickness, strengthening measures shall be taken. The concrete strength of
the main structure where section steel is anchored shall not be lower than C20.


2.2.5 Side Elevation of Overhanging
Scaffold (Unit

mm)

2.2 Scaffold

Overhanging

Illus. 2.2.1~2.2.5


Life First, Safety First

wall
internal tube

ĭH[SDQVLRQEROW
10mm steel plate with fully welded pipe

fastener anti-skid fastener
ĭ
VWHHOSLSH
external tube

structure

built-in steel pipe

fastening
steel pipe
10mm steel plate

2.3.1 Diagram of Wall Connecting Fitting (Method 1)Unit

mm
2.3.2 Effect Picture of Wall Connecting

Fitting (Method 2)Unit

Vertical Spacing
Steps h

2.3.3 Side Elevation of Wall Connecting
Fitting (Method 3)Unit

mm

Horizontal Spacing
Longitudinal space between
upright tubes la

mm

Built-over Area
of Each Fitting m2

Installation Method

Height

Double-row Floor
Standing
Double-row
Overhanging

İ50m

3h

3la

İ40

˚50m

2h

3la

İ27

Single Row

İ24m

3h

3la

İ40

2.3.4 Table of Max. Spacings of Connecting Fittings

Notes
1. The floor-standing scaffolds shall have wall connecting fittings (tie point), subject to specifications and
calculations. The fittings shall be firm and stable and shall not be randomly dismantled.
2. The wall connecting fittings of the scaffolds shall be set closer to the main joint, with the deviation being

not bigger than 300mm. For double row scaffolds over 24m in height, they have to be firmly connected to the
building structure with rigid wall connecting fittings.
3. The tie points shall be marked with red paint, with “No Dismantling” signs hung up.

2.3 Scaffold
Wall Connecting Fitting

Illus. 2.3.1~2.3.4



Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

skirting board

VORS

LQJ



access ramp width

2.4.1 Effect Picture of Scaffold Slope

Notes
1. For scaffolds lower than 6m, the line-shaped gangway shall be used. For scaffolds higher than
6m, the zigzag gangway shall be used. The gangway shall be built up to the operation level.
2. The gangway shall be attached to the external scaffolds or building structure.
3. The gangway shall be effectively tied onto the building structure.

4. For gangway used for delivery of materials, the slope shall be less than 1:6. For gangway for
people to walk, the width shall bigger than 1m with the slope less than 1:3.
5. The gangway shall have double rows of railings and skirting boards on the two sides and platform
boundaries. The height of the uppert railings shall be 1200mm, the middle railings 600mm and the
skirting board 200mm. The railings and the skirting boards shall be painted red and white caution
colors.
6. The scaffold board of the gangway shall be fixed one piece of anti-slip strip every 250 – 300mm,
with the thickness of the wooden strip being 20 – 30mm.
7. The gangway shall be covered with fine mesh safety vertical net, with its sides strengthened with
shear bracing.


access ramp width

2.4.2 Elevation of Scaffold Slope Unit:mm

access ramp width
access ramp width

2.4.3 Plan of Scaffold Slope Unit

mm

2.4 Scaffold
Ramp

Illus. 2.4.1~2.4.3


Life First, Safety First

Min. Operating Distance between Building
and Overhung Power Line
external power line
Min. Safety Operating Distance (m)
Note: No external power line shall be installed along the ramp of up
and down scaffolding.

3.1.1 Real Picture of External Power Protection

3.1.2 Effect Picture of External Power Protection

Notes:
1. Special plan shall be made and subject to approval based on voltage grade.
2. For project under construction, no such activities shall be permitted under external overhead power lines as construction, setting up of operation sheds, building of living facilities, or stacking of building components, scaffolds, materials and other clutters.
3. The minimum safety operation distance between the perimeter of buildings under construction (including scaffolds) and the external overhead power lines
shall be kept as per Drawing 3.1.2. For the safety distance not complying with the specifications, protective measures shall be taken such as insulation and isolation.
4. On construction sites, protection frames are generally set up, which shall be not less than 1m from the external power lines. The power shall have to be cut
during the setting up and demolition of the frames. If the frames stand closer to the working sites, then they shall be sealed with hard insulation materials to avoid
electric shock through the scaffolds and steel bars.
5. If the overhead power lines are within the working radius of tower cranes, protective measures shall be taken over the power lines. The top shall be covered
with 50mm wooden board or insulation materials similar to the strength of 50mm wooden board. To indicate the operation of the tower crane, small colored flags
can be put dispersedly on the protective frames, and colored lights (or LED lights) with safety voltage be used for night construction. used
3.1 Temporary Power
Protection of External Power

Illus. 3.1.1~3.1.2


Illustrations of Safety Protection on Sites of CSCEC’s Overseas Projects

double-layer hard protection
safety slogan

switch box

equipment
CSCEC logo

load line through tube
Concrete bearing platform

3.2.1 Diagram of Distribution Box Protection Unit

mm

mm

side of distribution box

front of distribution box

Notes:
1. The protective shed for distribution box, being of steel pipe and steel bar grid, shall be
securely installed on concrete bearing platform, and be grounded. The powder fire extinguisher shall be provided.
2. The top shall be of double-layer wooden springboards with the color steel plate set in
between and its slope being not less than 5%.

3.2.2 Elevation of Distribution Box Protection Unit

3.2.3 Elevation of Distribution Box Protection Unit

mm

3.2 Temporary Power
Protection of Distribution Box


Illus. 3.2.1~3.2.3