Thuyết minh biện pháp thi công nhà xưởng bằng tiếng anh

A.I.4.1 Foundation execution method 7 A.I.4.2 Concrete execution method for body part 91 Execution of wall, concrete, steel, pit floor 9... Execution of wall, concrete, steel Base on str

Thuyết minh biện pháp thi công nhà xưởng bằng tiếng anh

PROGRESS

Project: NienHsing-Garment Location: Thaibinh province

A.I.4.1 Foundation execution method 7 A.I.4.2 Concrete execution method for body part 9

1 Execution of wall, concrete, steel, pit floor 9

6 Electricity, thunder proctection 22

7 Drainage and supply water system 23

A.II Construction execution progress and construction progress guarantee 24

A.III Guarantee method of construction quality 25

A.III.2

The explanation about material and machine supply

Contractor will appply works standard guarantee quality

1 Technical supervisors 26

2 Technical engineers and workers in work 26

A.III.4 Equipments for execution 26

A.III.8 List of main materials used in construction 28 A.III.9 Technical method to guarantee work quality 29

A.III.10 Apply progressive science and techonology in construction 30

A.III.11 List of main machine and equipment in construction execution 31

Part B: Fire fighting method, safety-insurance bid

environental hygiene safely for surrounding work 33B.I Fire fighting method, safety-insurance bid environental

hygiene safely for surrounding work 33

B.I.1 General explanation 33 B.I.2 Safety –insurance for worker, risk of contractor 33 B.I.3 Material safety, equipment 34

B.I.6 Fire ,earthquake, flood and storm prevention method 34 B.II Safety for surrounding work 35

PART A

TECHNIQUE AND PROGRESS CONTENT

A.I:EXECUTION METHOD EXPLANATION

A.I.1: INTRODUCTION

Project :NienHsing-Gament

Location: Thai Binh -Province

1 Content of bidding package

Construction work is built on the area DaiTin Industrial –Thai Binh Province

Contruction work includes 20 articles Main factory has size 403×60

m Moreover, It has some articles such as : guard house, birk shed Construction work has great denstity, thus in construction progress,

it is necesar to locate plan reasonably

A.I.2: PREPARATION WORK

Contractor confirms preparation with large decision to quality of construction After searching for drawing contractor sees that this work requires high quality art, these are some preparation of

contractor before execution

contractor has planed to prepare manpower, materials, and

construction equipments Document is proceeded by contractor and finished when starting execution

2 Human Resource Contractor will appoint a vice director who

controls execution directly

_ Technology department of contractor has an experienced team

of staff who regularly follows up quality of construction work

_ Manpower: Contractor has been executing many project of

Taiwan, China, Korea and Japan, so contractor has a skillful and

responsible team in construction work However, contractor still confirm quality of human resource to the success of contractor Hence, staffs are still trained to enhance ability and especially, 100% of workers are must work with good health skills and

safety

_ Human resource: Contractor arranges human resource depend

on work, especially main work like concrete building, plaster will

be guaranteed for production line Professional labor team

divided into plaster, building, plaster, steel, concrete, electricity, water supply, equipment installation is combined tightly with each other in execution to ensure progress

_ Equipment: Contractor has plan to use equipment reasonably, depends on work amount and progress, to supply on execution time, right standard

4 Plan

Plan preparation affects to execution progress and

construction work quality significantly To arrange reasonable plan, contractor will proceed survey and search for plane,

confirming plan of execution, set up execution progress in detail for each category to define office location, store, material ground,mixing machine area and entrance during execution time

Contractor proceeds preparation such as locating

construction, calculating material transport road, transport land, necessary area for mixing concrete ground, small structure,

installation, mixing mortar, brick ground and formworks, steel ground and ensure arranged reasonable plan.

After calculating for necessary, contractor proceed to protect from dust for environment

1 Requirements when arranging execution plan

When arranging the execution plane, contractor will calculate

to ensure following factors:

 Offices and depots: Ensure enough area, satisfy functions of office

 Store floor is embanked high and chocked for damp-proof to cement

 Inflammable materials are put separately and packet in

buckets

 Fire extinguishers in offices and depots

 Security office: Near the entrance and observable to

everywhere in the construction site Fixed telephone, fire

extinguishers, security equipments in security office

 Reinforcement executing ground: Tent floor is built high and have satchels

 Formwork assembling ground: Contractor uses most of

corrugated ion formwork The system to support formwork is log

of wood and steel log Contractor is responsible for maintaining formwork

Contractor also uses both steel and wooden formwork Thus, processed formwork must be far away from depots

There are 2 main power sources:

 For equipments and machines

 For other activities

Contractor installs tension pole across roads, wire is larger than

Arrange plan, contractor guarantee the standard of work,

environment, security and safety

A.I.4 EXECUTION METHOD

GENERAL REQUIREMENT

Guarantee execution steps as same as design

Guarantee safety for people, machines and work

Guarantee surrounding environment

Avoid making noise

Clean transport means when leaving the work

Contractor covers the boot of bike when going out the wor

In order to set up, maintain figures in work correctly, survey team receives a border line and investor’s standard (receivable certificate) Then, team is responsible for defending border line and fix.

Base on border line high standard to main pivot, set up pitch system to confirm the pivot Setting up pitch by: each pitch is confirmed by center point This point is set up to use easily and exactly, not affect to execution In execution, contractor bases onpitch and height to execute according to requirement of investor and drawing

Survey is always checked and noted in detail Figures are announced to investor

A.I.4.1 FOUNDATION EXCUTION METHOD

1)Excavation method

Due to large amount of land, we use both method of machine and manuals Excavating by machine is used regularly, using manuals to fix foundation hole Excavating and fixing foundation hole follow to designed depth

Around hole, drainage ditches and arrange pump to absorb water continuously in case of rain

Excavation process is suitable for restriction to guarantee the stability of roof In case of less stable place, we process to build stake

Dimension, form, height of foundation hole must be suitable for design Taking over before going on next work

* Risk of excavation

Digging in the heavy rain causes soil fall After rain, filling in hole, change 15cm in hole in comparison to designed level After fixing each ground layer, replacing foundation by concrete bricks There is “underground rock” or other, replace by mixing sand and crushed rock.

Filling up foundation hole

After executing foundation concrete, filling foundation hole

* Technical requirement in filling land

When covering sand, guarantee that foundation sand has moisture in restricted area Dry sand needs to be watered; reducemoisture for much humid sand

Cover sand and distribute into each layer and stamp

*Technical method

Use compactor and worker

Stamp layer to another tightly

Fill sand by line

2 Foundation work

After finishing foundation, place and fix it

Pour the lean concrete layer for foundation Use survey machine

to confirm centre and mark on the surface of middle layer

concrete Proceeding steel installation when the concrete commit

to the hardness Use block for small concrete with the same

depth as concrete layer for steel Label of this is equal to one of foundation concrete

After reinforcement assembling, installing casing used iron formwork Foundation formwork commit to designed type

Foundation casing is kept by steel column which is wrapped and wooden column It is important for contractor to guarantee

stability of formwork

Checking steel formwork and cleaning before pouring

concrete

Pour foundation concrete: Replace mixed concrete into

concrete pump Material of concrete commits to clean standard Use stamping concrete d=45-60mm to stamp concrete The concrete is poured into each layer and damped following to

technique Surface of foundation is smooth by hawk, guarantee flat degree and designed level

Covering foundation is only proceeded after maintaining concretefollowing technique finishing, underground work and accepted by investor

A.I.4.2: CONCRETE EXECUTION METHODS FOR BODY PART

RAW MASONARY

1 Execution of wall, concrete, steel

Base on structure design contractor estimate, design using casingand recycling during work

Reinforcement assembling

Tie block concrete with the same thickness as protected concrete and grade as one of structure concrete

Preliminary acceptance for reinforcement

Drill concrete floor to hammer steel to fix wall thickness

Formwork assembling in one side only

Pour concrete for wall

2 Reinforcement assembling

Before install steel for the wall, contractor uses survey

machine to define centre of pivots on the concrete floor

Base on pointed centre on the concrete, check the right position of steel, tight steel to other steel in case of right position

* Wall reinforcement procedure

– Drill to create roughness of wall foot concrete and clean – Adjust straight ahead steel bar, ensure distance between steel bar

– Connect straight steel bars with another

1 Wall formwork combination

Contractor confirms: Formwork combination must make wallstraight, flat, smooth Thus, formwork must be hermetic, stable Corrugated iron formworks have the same size as structure size

In case of missing corrugated iron formworks, contractor uses wooden formwork Contractor cleans and paints a petrol layer before using to untie easily

* Formwork assembling procedure

Base on defined centre of pivot Line 2 lines to wall edge Drilled hole D12, distance 1.5m per 1 hole.

Hammer steel pieces D12 following to line in order to

become bolt inside formwork

Combine one side corrugated iron form work

Install steel boxes into 3 lines:

Line 1: 20cm from bottom of concrete wall

Line 2: 60cm from Line 1

Line 3: 15cm from wall surface

Boxes control thickness of concrete wall If thickness of wall always commit to standard, casing will not be deformed

After installing and fixing boxes bar, conducting to tie

concrete block into other steel wall side Then, clean wall foot and combine casing

After combining, casings are propped up by length control machine Contractor uses D12 cable with control machine to control and to pull casing inverse to propulsive force of pulled bar in order

to balance pressing force on casing, guarantee stability of casing and control wall casing to the right or the left easily

After combining casing, contractor invites investor to check Next, contractor prepares to pour concrete

 Concrete pour requirements

Avoid changing position of steel, formwork and guarantee the depth of protected concrete layer

Pouring concrete continuously in oder to avoid separately of concrete until finishing any structure following to design.

The height of falling concrete is smaller than 1.5m to avoid classifying If it is higher than 1.5m, pour concrete by sloping

conduit or movable pipe Material conduit must be smooth and

hermetic Material conduit width is as 3.5 times as the largest

diameter of reinforcement Slope of conduit is guaranteed for

concrete not stuck

 Pouring concrete note:

Formwork, scaffold and reinforcement are tested tightly in case of trouble

Concrete is stamped by stamping machine All position is stamped in the right way

Canvas is available to cover concrete when rain Concrete is not poured because of problems, wait until it reaches at 25kg/cm2 Before pouring, roughness flat is handled, pour solid cement, mix additive for damp-proof

Thickness of concrete layer bases on concrete supply,

transport distance, type of stamping power, characteristic of

structure and it doesn’t exceed standards:

Straight stamping: Length of each layer <= 1.25 length of stamping

Across stamping: Length of each layer is 12- 20cm

Following and noting contents in periods of pouring concrete: Beginning and ending time

Concrete grade, depression

Concrete amount in each period

Check concrete sample

Temperature

Concrete temperature

Concrete maintenance: Useful for developing speed of

concrete according to design requirement, method, and concrete maintenance procedure TCVN 5592-1991 “Heavy concrete requires natural warm maintenance” Moisture maintenance procedure

divided into 2 periods: first maintenance and following maintenance

1 Reinforcement concrete column execution method

To executing column, contractor gives execution order:

Use Theologize to place centre of pivot

Confirm size of column circumference

Drill and hammer D12 onto edge

Install reinforcement concrete column

Tie steel concrete block

Acceptance for column reinforcement

Combine 3-size formwork of column

Adjust, fix 3-size formwork box on the right position

Adjust straight reinforcement column, block to guarantee protected layer for reinforcement around column

Clean pivot foot

Combine other size of formwork

Adjust; prop up formwork in the centre of pivot and straight Acceptance for column formwork

Method of propping up and adjusting formwork column

When pouring the floor concrete, contractor calculate to place anchor on the floor surface to be point to hook cable

To control column, contractor estimates to prop up

First line is next to floor surface

Second line is 1.4m from floor

Third line is 50 cm from column

(Base on specific height of each column, contractor adjusts distance

of 2 columns)

To balance force and pull in or pull out easily, contractor uses column to pull by steel and cable with diameter 8-12mm

To check vertical of formwork column, contractor equips plumb bob for each team, combine with survey team to check

straight level of formwork

The column with the height of more than 1.5m, contractor arranges concrete door across formwork column so that height of concrete <= 1.5m Concrete door is next to the largest In column foot, contractor arranges 1 toilet door to clean that

Contractor install waiting steel to combine wall

After taking quality of formwork column, contractor invites investor to check and conduct to pour concrete

Contractor swept a petrol layer to prevent formwork to

absorb cement to untie casing easily

b Concrete column execution

Contractor waters column foot then close cleaning door in column foot

Avoid separating concrete; contractor pours a yellow sand layer mortar with rate 1/2 in foot column before pouring concrete

With high concrete column, contractor pours concrete into many layers Thickness of layer <= 40cm After finishing, contractor

continues to pours other When stamping, power-hammer is staked out into previous layer to guarantee separation

Contractor knocks surrounding casing so that concrete

surface is smooth besides stamping

To control the height of concrete column, contractor uses theodolite to confirm stamping bottom Stamping bottom is used to pour concrete column Contractor marks red paint line on the

surface of formwork column as control landmark for height

Concrete column requirements

After untying casing, concrete surface must be smooth

solid

Untied column has square sharp, angles aren’t changeable Right position for column

Column must be straight

c Formwork combination notices

If there is any leaky hole, it needs maintaining and preparingcasing

2 Reinforcement , casing and concrete floor beam

Execution order this procedure affects to progress and quality of work Contractor gives casing execution procedure so that executionprocedure is circulated:

Use survey machine to check beam

Install beam untie system

Adjust top column to beam bottom

Install satchel

Cover corrugated-iron formwork as beam formwork

Use survey machine to check or beam bottom

Adjust beam bottom according to design

Check beam bottom casing

Install beam steel

Install formwork into beam

Install column to prop up floor

Cover formwork into floor formwork

Check casing and beam

Install floor reinforcement

Check floor beam casing and floor beam steel installation

1 Floor beam casing execution

General requirement

Casing and column structure bases on casing structure, commit to following requirement:

– Guarantee right size and sharp

– Guarantee tight to avoid loss of cement

This affects to execution progress and work quality significantly.Contractor uses Pal and Minh Khai scaffold casing combining with wooden formwork so that work gets high quality and execution

process The system is installed to guarantee the high stability These materials are used to execute the following casings:

– The system of propping scaffold combining steel column

constriction

– The combination between U steel cross bar and wooden satchel.– The combination among casing corrugated iron and wooden pressing casing

* Preparation steps:

– Contractor calculates the height of scaffold which is used for the propping straight for each girder, floor system based on the building height

– Calculate the capacity which presses into wooden satchel in order to define the height it.

– Define the general height of all materials:

 The height of scaffold

 The height of wooden satchel of girder and floor

 The thickness of corrugated – iron formwork

Contractor arranges the executing formwork team based on the amount of work

The system of PAL and Minh Khai scaffold will be put upon the jack system to adjust height The foot jack will be put upon the thick casing to avoid its concentrating force to concrete casing Minh Khai scaffold will be used to plaster and build work

Contractor uses steel bar alternated wooden propping to ensure safety and right techniques for stair execution

Contractor will put the parts of materials available in

concrete such as bolt, iron hook… to use for the works of later parts, pipe other materials following design

Floor casing is installed by fixing steel casing which connects

to each other to form a large part The system of casing will be put upon the system of steel satchel and PAL scaffold

Adjust the system of casing, floor according to design

Contractor uses foot jack, top jack of scaffold system which can

be adjusted up and down with the check of measuring devices Contractor will organize to take over casing to avoid later unfortunate mistake before installing reinforcement The take- over content includes rechecking centre, rod, the height of casingaccording to design Check shape, size, smooth, clean, stability ofcasing Check the stability of casing, scaffold and floor

Contractor ensures the right time, ensure concrete attain theright volume and contractor also ensure to have enough take-over note which attain the result.

b Reinforcement and casing execution

Contractor proceeds installing reinforcement upon the system

of already finished casing right after installing them

The type of reinforcement will be put at least 45cm high from the floor and stay in the roof factory area before and after

being curved Reinforcement must be ensured to be cleaned before pouring concrete without oil or other poisonous

substance

Contractor will arrange enough materials, machine which serve for processing cool curving, installing reinforcement according to designwhich is registered by investor and TCVN 8874-91

Reinforcement work will be processed right at construction and theninstalled at right position according to design and located reliably Constructor arranges each steel team which is delivered the specificworks with different department

Floor reinforcement, stair are installed right upon the system of floorcasing Constructor will install main reinforcement beam right after installing the system of bottom casing beam Constructor will install secondary reinforcement beam outside and then locate at beam’s design position

Reinforcement is connected with each other soft steel line

(0.8-1mm) to ensure the stability when pouring concrete Nut and code connect surely to straight steel by tying or wielding Wielding

reinforcement work will be processed according to TCVN

5724-93(VN STANDARD 5724-93) The wielded beams are suitable with necessary demand and they will not be crust over and

swollen Contractor will cast the concrete mortar

blocks which has the height equal to reinforcement protection

concrete of each structure according to design to ensure the later pouring concrete work

Contractor follows all the reinforcement work according to

design notice and investor

Contractor will invite investor’s technical supervisor to take over andsign the papers about reinforcement

c Floor concrete beam execution

Concrete work is processed right after taking over

reinforcement installation, the take-over documents are complete.Contractor also does the check of casing system, scaffold to

ensure the stability in pouring concrete process before officially pouring concrete

Concrete beam, floor use commodity concrete poured by pamp

Contractor calculates to pour each concrete within a day Concrete will calculate to guarantee technical demands about circuit

Execution circuit and execution circuit method.

Concrete must be stopped pouring according to restriction about circuit if the pause time of pouring concrete is up to 90min

in any circumstances

Contractor will commit to TCVN 4453-95 standard about

concrete pouring circuit

Floor concrete pouring circuit is 1/3 span to the perpendiculardirection to short side and to the pouring concrete direction

Circuit must have 1mm flexible steel net to connect later section; it must be blocked so that concrete will not be flown

After stopping pouring concrete, if the next block concrete is poured, the circuit contact must be carved roughly and watered

by solid cement, at this point, we use washer water proof and gluelayer Contractor will pour a mortar layer with rate 1:2 with damp proof additive

Notice when pouring concrete contacts with circuit:

1 Concrete at circuit can not mixed with large rock or in pouring concrete process rocks are concentrated in circuit, they must be given away

2 Stamping carefully without any mistake

 Concrete pouring method for

floor Divide pouring concrete part: Concrete part is defined for each small pour so that the pouring time is not up to 60min after being finished This method is to cut concrete pouring work

in order to not be concentrated; therefore, concrete will not be separated Moreover, after pouring the later concrete layer, the previous begins

Pour the floor concrete, contractor applies myriopod method

When pouring each layer, contractor uses stick to cover in order to the thickness of concrete is 1 cm bigger than one of floor Then, compacting carefully until there is an appearance of concrete

layer This the time, contractor stops compacting and conducting to complete the concrete surface

To confirm the thickness of floor concrete, contractor uses astick connected to a bar The thickness of concrete commits to

standard when when concrete surface meets the bar Besides

checking method, contractor arranges a survey machine to combineflat level and high level in pouring

concrete

Maintenance method after pouring concrete:

Contractor needs to prepare satchel, casing to prevent rain or sunlight which affects to the quality of concrete

Concrete maintenance is an important part to have stable

concrete and prevent structure surface from split To guarantee the quality of concrete, contractor maintain concrete after 7

hours For the floor, contractor focuses on damp-proof

After pouring concrete and complete concrete surface, contractorprevent work from radiation of the sun according to requirementsand TCXDVN: 318-2004 about maintenance and concrete

structure

Concrete needs maintaining at least 7 days continuously and watered during that time

 Requirements in concrete execution of the work

Before using, contractor gives investor quality certificate to

guarantee no alkali reaction

After designing concrete, contractor gets the sample to check Materials with standard is kept in the construction site to

compare with other

In case of the rain, contractor covers against water

Concrete experiment:

After pouring concrete, contractor gets concrete samples in the work The sample must have date, month, year, work name Eachsample group includes 6 pieces.3 pieces have age of 7 days and

3 pieces of 28 days

Contractor guarantees experiment equipments in the

construction site and maintains during execution time:

+ Standard screen system

+ Suitable weighbridge, equipments to identify moisture

+ Gauge glass

+ Concrete test equipments:

Cudgel and beam

16 metal patterns with 150mm to try cube sample

Cistern 1 2*1.2*0.6 to maintain concrete

Bricks must be solid, not separated and reach the standard Half baked bricks, brickbats are rejected

Mortar commits to design Using mixing mortar after 30 minutes, not using mixing mortar for a long time

b Preparation

In the construction, contractor puts lead of waited steel to

connect wall to reduce plasticity of construction blocks and