thuyet minh bien phap thi cong lap dat nha xuong

Execution of wall, concrete, steel, pit floor Base on structure design contractor estimate, design using casing andrecycling during work.. Preliminary acceptance for reinforcement Drill

TECHNIQUE EXECUTION METHODS

AND CONSTRUTION WORK PROGRESS

Project: Hanoi sky lake resort golf club house

Location: Chuong My town- Ha Tay province

PART A TECHNIQUE AND PROGRESS CONTENTA.I:EXECUTION METHOD EXPLANATION

A.I.1: INTRODUCTION

Project: Hanoi sky lake resort golf club house

Location: Chuong My town- Ha Tay province

1) Content of bidding package

Construction work is built on the area of golf court in Chuong My town Ha Tayprovince

Work area: Building all the club building

- Transportation means must be cleaned, not dirty tires, no garbage on the street

A.I.2: PREPARATION WORK

Contractor confirms preparation with large decision to quality ofconstruction After searching for drawing contractor sees that this work requireshigh quality art, these are some preparation of contractor before execution

1) Document

After searching for contractor’s drawing which manage quality work, setting up legal document management is through out from company to construction site such as: employee document includes labor contract, labor safety commitment; material equipment management file includes tested material quality results, checking equipment; completion certificate In Contractor office, there a team of skillful engineer who sets up solution method execution progress for each work in details Pursuant to execution progress file, 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 whoregularly 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 inconstruction work However, contractor still confirm quality of human resource

to the success of contractor Hence, staffs are still trained to enhance abilityand especially, 100% of workers are must work with good health skills andsafety

_ Human resource: Contractor arranges human resource depend on work,especially main work like concrete building, plaster will be guaranteed forproduction line Professional labor team divided into plaster, building, plaster,steel, concrete, electricity, water supply, equipment installation is combinedtightly with each other in execution to ensure progress

3 Material, equipment

_ Material and supply: Investor must test material before using, quality of mainmaterial must be tested Material must be estimated to be suitable for progressand construction plan in each period In this work contractor focuses onconcerning about things for high quality and artic construction work

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

4 Plan

Plan preparation affects to execution progress and construction workquality significantly To arrange reasonable plan, contractor will proceedsurvey and search for plane, confirming plan of execution, set up executionprogress in detail for each category to define office location, store, materialground, mixing machine area and entrance during execution time

Contractor proceeds preparation such as locating construction, calculatingmaterial transport road, transport land, necessary area for mixing concreteground, small structure, installation, mixing mortar, brick ground andformworks, steel ground and ensure arranged reasonable plan

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

 Main requirement

After calculating above floor limiting fallen materials as well as dust

After executing floors, Contractor will proceed to spread

A.I.3-ARRANGE PLAN

Plan must be installed electricity, water supply, control office, tent, depot,other tents are arranged to be convenient for execution

Construction concrete is fresh concrete and use concrete pump

1 Requirements when arranging execution plan

When arranging the execution plane, contractor will calculate to ensurefollowing 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 theconstruction 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 ionformwork 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, processedformwork must be far away from depots

cables with 3 phases or 4 cores There is electricity clock to measure electricitynumbers

There are 2 main power sources:

- For equipments and machines

- For other activities

Contractor installs tension pole across roads, wire is larger than or equal 4m

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 isresponsible for defending border line and fix

Base on border line high standard to main pivot, set up pitch system toconfirm 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 Inexecution, contractor bases on pitch and height to execute according torequirement of investor and drawing

Survey is always checked and noted in detail Figures are announced toinvestor

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 watercontinuously in case of rain

Excavation process is suitable for restriction to guarantee the stability ofroof 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, change15cm 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 crushedrock

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 inrestricted area Dry sand needs to be watered; reduce moisture for much humidsand

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 confirmcentre and mark on the surface of middle layer concrete Proceeding steelinstallation 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 bysteel column which is wrapped and wooden column It is important forcontractor 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 ispoured into each layer and damped following to technique Surface offoundation is smooth by hawk, guarantee flat degree and designed level

Covering foundation is only proceeded after maintaining concrete followingtechnique 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, pit floor

Base on structure design contractor estimate, design using casing andrecycling 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

* 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

- Install cross-bar

- Adjust steel bars to guarantee size and distance between bar

- Tie steel and concrete block into one side, the number of block massensure to make steel stable and unbroken

- After finishing work, investor checks steel Contractor only proceeds tocombine formwork if it reaches requirement

a Wall formwork combination

Contractor confirms: Formwork combination must make wall straight, flat,smooth Thus, formwork must be hermetic, stable Corrugated iron formworkshave the same size as structure size

In case of missing corrugated iron formworks, contractor uses woodenformwork 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 insideformwork

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 alwayscommit to standard, casing will not be deformed

After installing and fixing boxes bar, conducting to tie concrete block intoother 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 casinginverse to propulsive force of pulled bar in order to balance pressing force oncasing, guarantee stability of casing and control wall casing to the right or the lefteasily

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

b Pit floor concrete wall pouring.

 Method

By concrete pump

Concrete is poured on the partition with the thickness of 30cm with manytimes to guarantee solid and adhesive degree

 Pit floor wall concrete stamping method

Before pouring concrete wall, contractor uses pump to water wall foot brickand pour a cement layer with rate ½ and mix additive for damp-proof Afterpouring mortar, pouring concrete immediately

Wall concrete has 14cm- landslide, distance between wall steel is large.Thus, contractor uses stamping machine with diameter D50, radius is equal as 1/3

as length of power hammer When covering next layer on previous layer, powerhammer is staked out with the depth of more than 5cm

 Concrete pour requirements

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

Pouring concrete continuously in oder to avoid separately of concrete untilfinishing 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 Materialconduit must be smooth and hermetic Material conduit width is as 3.5 times asthe largest diameter of reinforcement Slope of conduit is guaranteed for concretenot 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 theright way

Canvas is available to cover concrete when rain Concrete is not pouredbecause of problems, wait until it reaches at 25kg/cm2 Before pouring, roughnessflat 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 exceedstandards:

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” Moisturemaintenance procedure divided into 2 periods: first maintenance and followingmaintenance 2 periods is continuous

+ First maintenance: cover concrete surface by humid material to keepwater for concrete

+ Following maintenance: proceed after following maintenance untilstopping Watering for concrete surface regularly, times per day depend ontemperature, weather to keep it humid Maintenance times last from 5 to 6 days

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 layerfor 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 thefloor 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 topull by steel and cable with diameter 8-12mm

To check vertical of formwork column, contractor equips plumb bob foreach team, combine with survey team to check straight level of formwork

The column with the height of more than 1.5m, contractor arranges concretedoor 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 cleanthat

Contractor install waiting steel to combine wall

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

Contractor swept a petrol layer to prevent formwork to absorb cement tountie 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 withrate 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 guaranteeseparation

Contractor knocks surrounding casing so that concrete surface is smoothbesides stamping

To control the height of concrete column, contractor uses theodolite toconfirm stamping bottom Stamping bottom is used to pour concrete column

Contractor marks red paint line on the surface of formwork column as controllandmark 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 preparing casing

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 execution procedure iscirculated:

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

a Floor beam casing execution

General requirement

Casing and column structure bases on casing structure, commit to followingrequirement:

- 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 woodenformwork so that work gets high quality and execution process The system isinstalled to guarantee the high stability These materials are used to execute thefollowing 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 pressingcasing

- 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 ofwork

The system of PAL and Minh Khai scaffold will be put upon the jacksystem to adjust height The foot jack will be put upon the thick casing toavoid 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 andright 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 followingdesign

Floor casing is installed by fixing steel casing which connects to eachother to form a large part The system of casing will be put upon the system ofsteel satchel and PAL scaffold

Adjust the system of casing, floor according to design Contractor usesfoot jack, top jack of scaffold system which can be adjusted up and down withthe check of measuring devices

Contractor will organize to take over casing to avoid later unfortunatemistake before installing reinforcement The take- over content includesrechecking centre, rod, the height of casing according to design Check shape,size, smooth, clean, stability of casing Check the stability of casing, scaffoldand floor.

Contractor ensures the right time, ensure concrete attain the right volumeand contractor also ensure to have enough take-over note which attain theresult

b Reinforcement and casing execution

Contractor proceeds installing reinforcement upon the system of alreadyfinished casing right after installing them

The type of reinforcement will be put at least 45cm high from the floor andstay in the roof factory area before and after being curved Reinforcementmust be ensured to be cleaned before pouring concrete without oil or otherpoisonous substance

Contractor will arrange enough materials, machine which serve forprocessing cool curving, installing reinforcement according to design which isregistered by investor and TCVN 8874-91 Reinforcement work will beprocessed right at construction and then installed at right position according todesign and located reliably Constructor arranges each steel team which isdelivered the specific works with different department

Floor reinforcement, stair are installed right upon the system of floor casing.Constructor will install main reinforcement beam right after installing the system

of bottom casing beam Constructor will install secondary reinforcement beamoutside and then locate at beam’s design position

Reinforcement is connected with each other soft steel line (0.8-1mm) toensure the stability when pouring concrete Nut and code connect surely tostraight steel by tying or wielding Wielding reinforcement work will be processedaccording to TCVN 5724-93(VN STANDARD 5724-93) The wielded beams aresuitable 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 toensure the later pouring concrete work

Contractor follows all the reinforcement work according to design noticeand investor

Contractor will invite investor’s technical supervisor to take over and signthe papers about reinforcement.

c Floor concrete beam execution

Concrete work is processed right after taking over reinforcementinstallation, the take-over documents are complete Contractor also does thecheck of casing system, scaffold to ensure the stability in pouring concreteprocess before officially pouring concrete

Concrete beam, floor use commodity concrete poured by pamp

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

Execution circuit and execution circuit method.

Concrete must be stopped pouring according to restriction aboutcircuit if the pause time of pouring concrete is up to 90min in anycircumstances

Contractor will commit to TCVN 4453-95 standard about concretepouring circuit

Floor concrete pouring circuit is 1/3 span to the perpendicular direction toshort side and to the pouring concrete direction

Circuit must have 1mm flexible steel net to connect later section; it must beblocked 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 thispoint, we use washer water proof and glue layer Contractor will pour a mortarlayer 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 concreteprocess 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 pouringeach 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 anappearance of concrete layer .This the time, contractor stops compacting andconducting to complete the concrete surface.

To confirm the thickness of floor concrete, contractor uses a stickconnected to a bar The thickness of concrete commits to standard when whenconcrete surface meets the bar Besides checking method, contractor arranges asurvey machine to combine flat level and high level in pouring concrete

Maintenance method after pouring concrete:

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

Concrete maintenance is an important part to have stable concrete andprevent 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, contractor preventwork from radiation of the sun according to requirements and TCXDVN:

Concrete needs maintaining at least 7 days continuously and wateredduring that time

 Requirements in concrete execution of the work

Before using, contractor gives investor quality certificate to guarantee noalkali reaction

After designing concrete, contractor gets the sample to check Materialswith 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 Thesample must have date, month, year, work name .Each sample groupincludes 6 pieces.3 pieces have age of 7 days and 3 pieces of 28 days

Contractor guarantees experiment equipments in the construction site andmaintains during execution time:

+ Standard screen system

+ Suitable weighbridge, equipments to identify moisture

+ Gauge glass