Đây là biện pháp công ty nước ngoài về vấn đề an toàn loa động trên công trường.Việc xây dựng mới hoặc mở rộng, cải tạo cơ sở để sản xuất, sử dụng, bảo quản, lưu giữ và tàng trữ các loại máy, thiết bị, vật tư, các chất có yêu cầu nghiêm ngặt về an toàn lao động, vệ sinh lao động, phải có luận chứng về các biện pháp bảo đảm an toàn lao động, vệ sinh lao động đối với nơi làm việc của người lao động và môi trường xung quanh theo quy định của pháp luật.
Trang 2regulations, 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 construc-tion 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
Trang 3Technical 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
Trang 51 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
Table of Contents
Trang 6Notes：
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
opera-tions
1.1.1.1 Diagram of Foundation Pit Edge Protection 1.1.1.2 Elevation of Foundation Pit Edge Protection Unit:mm
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
Trang 7Notes：
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
4 Warning lights shall be set at special locations
1.1.2 Diagram of Edge Protection for Floor, Balcony and Roof Unit ：mm
1.1.2 Protection of Height Operations-Edge Protection Protection of Floor, Balcony & Roof Edge Illus 1.1.2
Floor N+1
Floor N
Trang 8Notes：
2 Spacing of upright tubes shall not be larger than 2000mm
3 Fine mesh safety vertical net shall be installled inside the protective railings
1.1.3.1 Elevation of Stairway Edge Protection Unit：mm
1.1.3 Protection of Height Operations-Edge Protection Protection of Stairway Edge Illus 1.1.3.1~1.1.3.2
Trang 9Notes：
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
1.1.4.1 Detail of Screw Extruding Edge Protective Upright Tubes Unit：mm 1.1.4.2 Detail of Disk Extruding Edge Protective Upright Tubes Unit：mm
1.1.4 Protection of Height Operations-Edge Protection Protection of Operation Line Edge Illus 1.1.4.1~1.1.4.2
Trang 101.2.1.1 Diagram of Reserved Hole Protection
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
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.
rail
up rail protective railing
Yellow/black paint full scaffold board
wooden board laid
on rebar net rebar two-way welded
Trang 11Notes：
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
1.2.2.1 Elevation of Protective Door for Elevator Shaft Unit：mm 1.2.2.2 Node Detail of Protective Door for Elevator Shaft Unit：mm
1.2.2 Protection of Height Operations-Hole Protection Protection of Elevator Shaft Illus 1.2.2.1~1.2.2.2
iron fence gate
skirting board spacing
Trang 12Notes：
1 Horizontal hard segregation: The steel pipe shall be set up through the wall Two
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
the horizontal safety net hung up
1.2.2.3 Diagram of Elevator Shaft of
Horizantal Hard Segregation
1.2.2.4 Diagram of Elevator Shaft Safety Level Net Soft Segregation
1.2.2.5 Elevation of Elevator Shaft Horizantal Protection
1.2.2 Protection of Height Operations-Hole Protection Protection of Elevator Shaft Illus 1.2.2.3~1.2.2.5
protective door
springboard or form board
hard segregation
hard segregation, initialfl
flat net soft segregation bolt hole through wall
Trang 13Notes:
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 Diagram of Post-cast Strip Protection
1.2.3 Protection of Height Operations-Hole Protection Edge Protection of Post-cast Strip Illus 1.2.3
level covering with bamboo board
water retaining bank
wood brace
Trang 14Notes:
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 ≧ 3m, and the width ≧ 2m For
buildings over 24m, the length of the passageway shall be ≧ 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
passage-way shall be sealed on the two sides and the top with form board, and be hung caution signs
1.3.1 Front Elevation of Safety Passageway Protective Shed Unit：mm 1.3.2 Side Elevation of Safety Passageway Protective Shed Unit：mm
1.3 Protection of Height Operations Protection of Passageway Illus 1.3.1~1.3.2
Safety Passage
steel pipe
upright tube
Trang 15Notes:
1 The operating platform shall have the area not exceeding 10㎡, the height not
exceed-ing 5.0m and the load-bearexceed-ing capacity not exceedexceed-ing 1.5KN/㎡ Stability calculation
shall also be made
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-ers It can also be fabricated with gantry or socket and spigot steel pipe scaffolds
Spac-ing 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
protective rail
scaffold board
ladder
secondary beam
Trang 16Notes：
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
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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
1.5.1 Side Elevation of Overhanging Discharging Platform Unit：mm 1.5.2 Structural Diagram of U-shape Bolt Fixing Overhanging Steel Beam Unit：mm
1.5 Protection of Height Operations Overhanging Discharge Platform Illus.1.5.1-1.5.2
ĭZLUHURSH DWOHDVWFOLSVIRUHDFKURSH external frame
Trang 17Notes：
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
1.5.3 Diagram of Steel Wire Rope Clamp 1.5.4 Table of Quantities of Steel Wire Rope Clamp
1.5 Protection of Height Operations Overhanging Discharge Platform Illus 1.5.3~1.5.4
Steel Wire Rope Φ（mm）Number of Clamps
≤19 3
19-32 4
32-38 5
38-44 6
44-60 7
Trang 18Notes:
1 For the main structure construction at heights, protective measures shall be taken and warning
lights be turned on at night
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
wire ropes shall be securely tied to the main structure
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
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
1.6.1 Plan of Object Falling Radius Protection of Main Structure
1.6.2 Effect Picture of Object Falling Radius Protection of Main Structure
1.6.3 Table of Grading of Height Operations
1.6 Protection of Height Operations Radius Protection of Falling Object
from Main Structure Illus 1.6.1~1.6.3
loop road
safety passage building
falling radius based on building height
safety passage
falling radius anti-falling measure
Operating Height/m Classification
A Risk-free Factor
B Risk Factor
C Falling Radius
Trang 192.1.1 Diagram of Horizantal Protection of Floor Stand Scaffold： Unit: mm 2.1.3 Effect Picture of Corners
2.1.2 Diagram of Floor Stand Scaffolds at External Exposed Corners
2.1.2落地式脚手架外排阳角做法示意图
2.1 Scaffold Floor-standing Illus 2.1.1~2.1.3
2 2.
2 2.
2.
2.
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net for next floor
initial net (flat) installed on 1st floor top
Trang 20Notes:
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
2.1.4 Diagram of Diagonal Bracing under 24m in Height 2.1.5 Diagram of Diagonal Bracing over 24m in Height
'LS$QJOHĮEHWZHHQ'LDJRQDO
Bracing Railing and Ground Max Quantities of Diagonal Bracing Cross Railings n 2.1.6 Diagram of Diagonal Bracing Lap Mode Unit: mm
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
q q q
swivel coupler swivel coupler
Trang 21Notes：
1 The one-time overhanging height of scaffolds shall not exceed 20m The section steel of
dual-axisymmetri-cal 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
2.2.1 Effect Picture of Overhanging Scaffold
2.2.3 Structural Diagram of U-shape
Anchor Bolting Unit：mm
2.2.4 Structural Diagram of Cantilever Steel Beam Floor Unit: mm
2.2.5 Side Elevation of Overhanging Scaffold (Unit：mm)
2.2.2 Structural Diagram of Cantilever Steel Beam through Walls Unit：mm 2.2.2 悬挑钢梁穿墙构造图 单位：mm
2.2 Scaffold Overhanging Illus 2.2.1~2.2.5
wood wedge, laterally wedged up
SLHFHVRIVWHHOEDUVORQJĭ
wedged up
Trang 22Notes：
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
2.3.1 Diagram of Wall Connecting Fitting (Method 1)Unit：mm
2.3.4 Table of Max Spacings of Connecting Fittings
Installation Method Double-row Floor Standing Double-row Overhanging Single Row
Height Vertical Spacing
Trang 23Notes：
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
2.4.1 Effect Picture of Scaffold Slope 2.4.2 Elevation of Scaffold Slope Unit:mm
2.4 Scaffold Ramp Illus 2.4.1~2.4.3 2.4.3 Plan of Scaffold Slope Unit：mm
skirting board
access ramp width
access ramp width
access ramp width
access ramp width
VORSLQJ
Trang 24Notes:
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, ing of living facilities, or stacking of building components, scaffolds, materials and other clutters
build-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 isola-tion
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
3.1.1 Real Picture of External Power Protection 3.1.2 Effect Picture of External Power Protection
external power line
Note: No external power line shall be installed along the ramp of up and down scaffolding.
Min Safety Operating Distance (m) Min Operating Distance between Building and Overhung Power Line
Trang 25Notes:
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
extin-guisher 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 Temporary Power Protection of Distribution Box Illus 3.2.1~3.2.3
3.2.1 Diagram of Distribution Box Protection Unit：mm 3.2.2 Elevation of Distribution Box Protection Unit：mm
3.2.3 Elevation of Distribution Box Protection Unit：mm
Trang 26Notes:
1 The protection shed of the processing plant shall be set up with steel pipe and fasteners
as shown in the drawings
2 The top of the protective shed, in double layers, can be of 50mm wooden board or other
materials with the same strength of 50mm thick wooden board The two layers shall be
vertical, with the spacing of 600mm
3.3 Protection Shed of Processing Plant Processing Shed Illus 3.3.1~3.3.2 3.3.1 Front Elevation of Shed of Processing Plant Unit：mm 3.3.2 Side Elevation of Shed of Processing Plant Unit：mm
steel pipe
Trang 271 The saw blade shall have wooden guard device on the top
2 Hard protection device shall be set around the gearing
3.4 Protective Hood for Machinery Protective Hood for Circular Saw Illus 3.4.1
3.4.1 Diagram of Circular Saw Protective Cover Unit ：mm
distributor
protective cover
Trang 28Note：
The protective cover for cutting machines, with fire-retardant
lining, can be made with formwork or made of color plate
3.4 Protective Hood for Machinery Protective Hood for Cutting Machine Illus 3.4.23.4.2 Diagram of Cutting Machine Protective Cover
Trang 301 Protection of Height Operations
1.1 Protection of Edge
1.1.1 Protection of Foundation Pit Edge… 26
1.1.2 Protection of Floor, Balcony and Roof Edge 27
1.1.3 Protection of Stairway Edge 28
1.1.4 Protection of Operation Line Edge 29
1.2 Protection of Hole
1.2.1 Protection of Reserved Hole 30
1.2.2 Protection of Elevator Shaft 31
1.2.3 Protection of Post-cast Strip 33
1.3 Protection of Passageway 34
1.4 Movable Operating Platform 35
1.5 Overhanging Discharge Platform 36
1.6 Radius Protection of Falling Object from Main
Table of Contents
Trang 31Notes：
1 Protection of foundation pit edge shall be done as shown in Front Elevation 1.1.1.1
2 Protective railings shall be installed 200mm skirting board on outside of the bottom
The railing and the board shall be painted red and white and black and yellow warning
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
1.1.1.1 Front Elevation of Foundation Pit Edge Protection Unit：mm
1.1.1.2 Effect Picture of Foundation Pit Edge Protection Unit:mm
1.1.1 Protection of Height Operations-Edge
Protection Protection of Foundation Pit Edge Illus 1.1.1.1~1.1.1.2
steel plate