1. Purpose

The purpose of this process is to ensure that the management of the installation work at the construction site will comply with the standards of Chi Viet CVC Steel Structure Joint Stock Company. Products must be installed according to proper technical measures and ensure safety.

2. Scope

This process applies to the project manager, project leaders, project engineers and technicians of the project department of Chi Viet CVC Steel Structure Joint Stock Company responsible for construction management pre-engineered steel building frame products.

3. References

Quality manual

American “Steel and Steel Bridge” Code of Conduct (AISC)

Decree 209/2004 / ND-CP of December 24, 2004 of the Prime Minister promulgating “Quality control of construction works”.

TCXD 170-1989: Tear structure, assembly and acceptance, technical requirements.

4. Definition

The erection process is the final stage to complete the product in the manufacturing process and supply of Chi Viet CVC steel buildings. The implementation of the processes is complied with the specific regulations on the quality management of existing construction works, and the process quality inspection and evaluation by organizations or individuals with functions such as supervision consultants closely coordinate with the inspection and implementation agencies.

5. Roles and tasks of the project team

5.1. Project Manager

  • To be responsible to the general director for all aspects of the project’s management.
  • Set up construction methods, supervise the implementation of the overall progress plan, including: Construction design, production management, materials supply, labor safety, payment, completion and finalization of works .
  • Take full responsibility in providing customers with necessary reports to ensure that the completed works are of high quality, ensuring necessary safety conditions and pre-determined completion dates.
  • Responsible for tracking the customer’s payment schedule, which is already linked to the delivery and installation schedules.
  • Plan and prepare all relevant contracts such as orders: installation contracts, labor safety supervision contracts with third parties, orders of accessories – construction equipment, contracts other services etc.
  • Appoint the project leader, technical supervisor, and occupational safety supervision at the construction site
  • Ensure appropriate planning, corrective and preventive actions to respond to all customer complaints

5.2. Commander in charge

  • Report to the project director
  • On behalf of the project director to handle the work when authorized.
  • Directly manage and direct all activities of the company at the construction site.
  • Prepare and supervise the implementation of detailed schedule of construction implementation.
  • Directly compile quality management dossiers, construction completion dossiers, payment dossiers and construction settlement according to the language level
  • Coordinating all installation and delivery activities at the construction site.
  • Planning, inspecting, monitoring and recording all OSH documents in accordance with the law, including: occupational accident insurance certificate, inspection of construction tools and equipment.
  • Supervise all artifacts at the construction site to maintain a safe working environment
  • Organize a meeting to remind workers at the beginning of the day and sign through safety measures applied in daily installation activities.
  • Check the use of labor protection equipment every day on the site.
  • Organize and report the inspection of occupational safety at the site for weekly signing.
  • Work with authorized personnel to request overtime work on site where necessary.

5.3. Construction engineering supervision

  • Report to the project leader.
  • Carry out work on the project according to the division of the project leader
  • Assign the site commander in daily activities / Construction Directive.
  • Making and recording work diary, acceptance records.
  • Supervise all construction personnel and installation work.
  • Monitor and inspect the work according to the prescribed process.
  • Preparation of test reports and laboratory reports.
  • Record and update the list of supplies and supplies at the construction site.

5.4. Construction captain

  • Report to site supervisor.
  • Preside at the meeting to remind workers of daily labor safety.
  • Organize daily construction work.
  • To carry out the inspection and acceptance of internal work 100% of the workload before the supervisor carries out the official inspection and acceptance.

5.5. Warehouse keeper

  • Report to site supervisor
  • Responsible for the preservation of supplies.
  • Delivery and receipt of all input and output materials at the public warehouse.

6. Procedure

6.1. Planning the project implementation

  • When there is a special request from a customer for a specific project. The General Director will assign specific tasks to the Director of the project execution project
  • The Project Director will organize a Kick-off Meeting with the Board of Directors to ensure that all necessary information about the project will be communicated to all relevant department heads.
  • Immediately, the project director will have to prepare an organization and mobilize the assigned implementation team (project leader, site supervisor, in charge of labor safety, construction team …) to disseminate for each members are familiar with the respective tasks and on what to do, in order to immediately start work with the authorized representative of the customer.
  • The project director will make a decision to appoint the project leader, supervise the labor safety and the project executive committee for the general director to approve, then officially send to the authorized representative of the customer.
  • Project Director sets up detailed schedule of production, delivery, installation, commissioning and payment of the project.
  • Project director, project leader and team leader will conduct site surveys and establish construction methods

6.2. Construction process

6.2.1. Planning and site preparation work

  • Site survey
  • It is important to ensure that there is a solid and clear transfer path so that the truck can be delivered and the truck crane can operate. Must clearly determine the capacity of the truck and crane truck is appropriate.
  • Investigate the prevailing wind direction, thereby compiling the profile of gathering roof sheets and installation directions.
  • Deciding on the loading and unloading plan for supplies should take a solid and dry location as a place for gathering supplies. Supplies should be stored in a designated area for each building block and clearly listing the location of each type in the storage area (warehouse). It is necessary to ensure that the supply and maintenance schedule for supplies is appropriate, and not deviated from the installation schedule and the progress of other subcontractors.
  • Conducting registration of connection positions using electricity / water on the construction site. The safest way to get these supplies to the work area should be secured
  • Check the purchase of insurance and organize occupational safety training for workers.
  • Check construction equipment, all equipment and machinery to make sure that the equipment meets normal working requirements.

6.2.2. Check the position of foundation and anchor bolts

  • Before installing the steel structure, it is necessary to examine the position and height of anchor bolts. The captain will carry out this check under the supervision of the site supervisor.
  • Elevation markers must be set in advance based on the required design elevation.
  • All survey equipment must be properly calibrated.
  • The strength of concrete foundation should reach 70% of design strength.
  • Anchor bolts must be anti-displacement position horizontally, vertically and vertically during the process from placing until after placing concrete.
  • Errors allowed as in the following

6.2.3. Delivery of materials at the construction site

  • The production department person will send a notice to the site supervisor 24 hours before delivery to ensure a loading plan.
  • There will always be a delivery order with the delivered material, clearly stating the name of the project, the location, type of material, number of gliding, the date of delivery …
  • As soon as supplies are gathered at the yard, the warehouse must match each type of material with the delivery order and confirm the number of goods received for delivery. The warehouse keeper will report to the site supervisor a list of supplies received and their quality status.
  • Can be unloaded manually or by crane. With the length structure, you need to use spreader, it is necessary to use nylon rope or cloth with a suitable hook to crane, to avoid damaging the materials. Make sure to attach the rope to the structure with the correct number of hanging points and positions, not to damage the crane material.
  • All materials at the construction site must be supervised by the construction site and supervised for damage (if any). If possible, these damages must be corrected immediately and avoid delaying the construction.

6.2.4. Preserving materials on site

  • Choose a solid, compacted, and dry area as a temporary storage for supplies.
  • Supplies are stacked at locations corresponding to the part of the work or area to be built and should be located next to the location where the crane hoisted up for installation. This will help classify and deliver goods conveniently during the construction process.
  • Care should be taken to preserve the tail of the structure to avoid twisting or twisting, which can be fastened at a position 1000m from the tail.
  • Materials must be stored to avoid dirt, grease and other impurities as well as protect from water and dirt from motor vehicles on the construction site.
  • Do not walk or step on supplies or structures.
  • All boulons, nuts, screws, small plates and accessories, must be properly packed and labeled.

6.2.5. Order of installation

  • The steel frame and other parts of a building can be constructed in a variety of ways, depending on a number of key factors:
  • Type of structure such as (type of small span house, large span house, low-rise houses, I-beam bridge structure, wide-belly type structure …)
  • Types of conditions available such as cranes, winches, manual lifting …
  • Site conditions.
  • Experience of the installation team.
  • Conditions of each job separately.
  • The construction order / measures must be researched and planned in such a way that it can be safely, economically and effectively carried out.
  • The process of specific construction measures for each project must be discussed in advance between the project commander and the construction captain, detailing the requirements in the minutes and signed for certification before starting the construction. .
  • There are some of the most common construction methods that have been confirmed over time. Below are typical guidelines for a single span structure and a double span structure:

Step 1: Install a rigid space column

Install 4 boundary columns and 2 middle columns, axis 2 & 3.

Use a 20 tonne crane, with a minimum arm length of 12m.

Use the straps to wrap around the code on the top of the column.

Crane capacity (Ton) Weight of crane (Ton) Rcmax reach (m) H (m) Length of boom (m) Crane capacity with max arm (Ton)
20 0.5 10 8 12.2 4.8

Align vertical, position, pitch.

  • Place construction scaffolding in each column
  • Tighten both anchors and bolts as required
  • Plumb line, theodolite and tape measure
  • Tighten the entire anchor bolt with a wrench with moderate binding force

Install all the purlin between the columns and tighten the boulon

  • Purlin lifting device: rope with safety keychains.
  • Turn device: tube wrench, moderate torque.

Make temporary braces on both sides of each column.

  • Using a 12mm cable, one end attaches to the outside wing of the column immediately below the column head plate.
  • The other end of the cable is connected to the iron bowl V, connecting the 2 boulon anchors together.

Step 2: Install the first rafters

  • Combination of RF1-1 & RF1-2 beams on the ground
  • Use the strap to wrap around the component at 2 points from the tip of the component about ¼ of the length, next to the purlin bowl. However, the outer part of the hanging point must be properly calculated to avoid the situation of twisting of components due to self-loading. cantilever sections must not exceed 1/3 of the length of structural members. The lifting angle should also be calculated to avoid twisting due to the vertical force when hoisting. For safety, it is recommended to use more than 2 tie fastening points.
  • Crane equipment: 20 ton truck crane should be at least 12m long
  • When assembling, it is recommended to use 50mm thick wooden rods to support the structure
  • High-strength boulon tightening device: Torque wrench, torque according to the recommended minimum torque (see Moment Torque table)
  • Temporary bracing and bracing against purlins against the rafters
  • Use sandpaper and a cloth to clean the components. The paint patch was scratched with a paint brush, with the correct paint system used.

Install a semi-truss on the pole

  • Use the belt to wrap around the structure at 2 points away from the tip of the rafters about 4m, next to the outer purlin bowl
  • Use a 20 ton crane
Crane capacity (Ton) Weight of crane (Ton) Rcmax reach (m) H (m) Length of boom (m) Crane capacity with max arm (Ton)
20 10 8 20 15
  • The first semi-truss crane is placed on the pillow position on the top of 2 consecutive columns, stabilized by crane
  • Workers will stand on scaffolding, piercing and fastening boulon flanges connecting columns and beams to a sufficiently tight state.
  • Using temporary bracing tie-down girders placed about 6m to hold this first rafter on the boulon nests with iron bowls V
  • Release the rope gently to see if the semi-stable is stable, before releasing the rope completely.

Repeat steps 1 & 2 to sell the remaining rafters, forming a complete rafter beam

STEP 3: Install the second beam

Do the same step 2 for the 2 rafters of the second girder frame

  • Use only temporary braces on the two sides in the middle of each half of the rafter, braced to the foot of the boulon tied with iron bowls of V.
  • Install insulation of purlins from top to bottom to keep the rafters in position.
  • Use a rope with a hook-locked hook to manually pull the purlins to the roof.
  • M12 purlin boulon screwing device: wrench, tube, normal tightening force.

STEP 4: Complete 100% of lock time

Installation of all ties, purlins, purlins – 100% of the quantity.

Install all permanent cross bracing cables of columns and rafters for the lock compartment.

Leave the braces loose (not stretched).

Balance truss beams.

  • The points to be measured are associated codes. Enter the allowable number of displacements between points as 1/500.
  • Use temporary braces to align the frame.
  • Completely tighten the permanent braces.
  • Sign test minutes through lock time.

STEP 5: Install the entire frame of the rafters and purlin

  • Install the entire boundary column and the middle column on the axes 4,5,6,7,8,9.
  • Use a 20 ton crane.
  • Use a 40 ton / 9 m belt to wrap around the first copy of the column.
  • Adjust the vertical, position and height of the column.
  • Follow steps 3 and 4 for all the rafters and purlin roofs. For a structural frame with a middle column, it is not allowed to install all of the rafter and then the other contract, doing so will change the design calculation scheme of the frame, causing imbalance of the frame. can lead to building collapse in bad weather.

STEP 6: Install the gable

Install all boundary column and middle column on axis 1.

Align vertical, position, pitch.

Tighten the entire anchor boulon.

Install the gable beam firstly on gable column.

  • Use a rope with a hook with safety buckle to manually pull the purlins up to the roof.
  • M12 purlin boulong screwing device: pipe wrench, normal tightening force.
  • Lightly release the rope crane to test the rest of the girder structure before stabilizing the rope.
  • Repeat step 4 for the remaining truss components, forming a gable beam.

STEP 7: Complete Installation of 100% purlin and purlin

Installation of all ties, purlins, purlins for 2 gables – 100% quantity.

  • Use a crane to lift the bracing beam strut (strut) on the roof.
  • Use a rope with a hook with safety buckle to manually pull the purlins up to the roof.
  • M12 purlin boulong screwing device: tube wrench, normal tightening force.

Install the entire permanent bracing of columns and rafters for the lock compartment.

Leave the braces loose (not stretched).

Balance truss beams.

Completely tighten the permanent braces.

Remove all temporary braces of the construction

Check and validate all connections, making sure all boulons are fitted. All high-strength boulons (structural boulons) must be tightened to the required tension.

Final inspection of the entire structure frame: correct azimuth and verticality.

STEP 8: Pull the corrugated iron to the roof

Place each corrugated iron sheet into each skateboard, hold by the 6mm iron hooks on the cable.

Each worker standing in each cross-tube on the rafters will use a rope to pull the sliding tube up to the roof carrying a corrugated iron sheet.

After corrugated iron roofing up to rafters, use manual transfer into place on purlin roof.

When pulling enough corrugated iron for the first compartment, the installation team will start the roofing work.

STEP 9: Roofing corrugated iron

Installing safety cable system on the roof.

Prepare the electrical system for construction:

  • Electrical wiring and shockproof circuit breakers (ELCBs) must be brought to the roof in safe conditions. The system must be elevated from the surface of the ground.
  • Electric conductors should be troughed into position of crossbars, avoiding direct contact with corrugated iron roof and purlin
  • Connect 2 power cables with 3-pin socket to circuit breaker cabinet, pull to the installation location to prepare for use.

Prepare the construction scaffolding system.

  • At least one scaffolding set up must be installed on the roof at the gable, daily up / down service.

Installation of corrugated iron sheet first.

  • Position the first sheet of steel so that the soup spreads to the gutter edge equally.
  • Installation of the entire roof sheet.
  • Check regularly to know that corrugated iron sheets are aligned vertically and along the edge of the gutter.
  • If the clearance from the final corrugated iron sheet to the gable wall or the side wall of the building is smaller than the width of the corrugated iron, it may be plashing or capping. In this case all positive waves must be covered and tightened.

STEP 10: Installing purlin – Wall corrugated-Gutter – Flush pipe and accessories

Prepare the construction scaffolding system

  • System of construction scaffolding must be arranged a distance of 300mm from the outside of purlin. All supplies will be conveyed in this 300mm space.
  • May allow the construction of corrugated iron corrugated iron roofing when passed safety testing of fixed link positions.
  • Workers will have to hook the safety belt directly into this scaffolding or ladder system.

Installation of purlin wall purlin, anti purlin between frame columns.

  • Purlin lifting device: rope with safety keychains.
  • Turn device: tube wrench, moderate torque.

Installation of purlin purlin, anti purlin between frame columns.

  • Purlin lifting device: rope with safety keychains.
  • Turn device: tube wrench, moderate torque.

Installation of the entire corrugated iron wall.

  • Pull the corrugated iron with a rope to attach to the corrugated iron.
  • The shockproof circuit breaker (ELCB) is located near the ground.

Installing gutters, pine leaves, valances, etc.

  • Screw driver: screw gun.

6.2.6. Kế hoạch giám sát và kiểm tra

Check and try to pull structure boulon and anchor boulon

The commander of the project will check the factory certificate of the entire boulon that will be used, making sure the boulon provided is the correct grade.

In case of a boulon granted without a factory certificate, take samples of each batch to bring an external unit to conduct mechanical tests in order to determine the mechanical properties clearly.

Check lock time

After the installation of the first 2 frames of the lockout, the construction supervisor will stop the work and will notify the project director to check and sign for approval.

The site commander must check and sign the status of bracing, recording to ensure that the project is not moved, incorrectly or collapsed during the installation process.

Check boulon tightening force

All 100% of boulon structures must be tightened by the captain.

The site supervisor will check the probability of 10% and notify the site commander. First tighten the 4.6 / S and 8.8 / S boulons.

Check boulon tightening force

  • Where necessary, additional gaskets or chem pads (made from the material supplied) should be made to ensure effective contact forces when the bonding is tightened. The entire chem pads should be painted with the same color as the main material.
  • The work of tightening the boulon as well as the final tightening of boulons should be carried out from the hardest part of each connection to the edge of the link.
  • Boulon tension should be tightened (previously tightened).
    • The exception, when tightening is only allowed to be performed once, is where the boulon is still located at the same boulon hole (where it was previously tightened) and at the correct length of hand. need.
    • It is not allowed to tighten the galvanized boulon.
    • In no case should it be permitted to use fully stretched boulon to reuse it elsewhere.
    • The tightening or tightening of boulons (tightened) is loosened when tightening adjacent boulons is not considered to be tightening.
  • The tightening of the boulons after the boulons is only carried out after the azimuth alignment and elevation are satisfied.
  • For S-type boulons, use a wrench to test the tension. The number of test pieces will be 10% for S-type boulons, but not less than 2 boulons for each junction (randomly taken).
  • Fastening boulon order
  • The pictures above show the order to allow the boulon fastening at any joint.
  • The tightening must be done through 2 rounds, the second round to ensure that the boulons are tightened evenly, Moment allows to use the boulon and check.
  • At the completed joints, the entire boulon must reach the minimum tension specified below. When all the boulons have been tightened:
Boulon diameter Minimum Moment
 (mm) (Nm) (ft-lt)
 12 87  64
16 213 157
 18 310 229
 20 416 307
 22 558 442
 24 731 539
 27 1049 774
 30 1443 1064
 36 2505 1847
  • The method of checking boulon torque, called tightening. Implementation: firstly all the boulon in the joint must be tightened tightly (by a worker tightening with a hand wrench 300mm long. Mark the relative position of the nut relative to the body of the boulon, then give tighten the boulon one third more round.

Azimuth test

  • The construction team leader is responsible for making 100% self-test of the components. Site supervisors are required to verify and have a formal report on the azimuth of the main truss and 2 gantry beams.
  • If feasible, it is advisable to calibrate immediately when installing each part of the frame structure. Do not make permanent connections connecting the components, until the appropriate part of the framework has been aligned with azimuth, elevation, and vertical, as well as azimuth, high degrees, verticals, and temporarily associated so that these components do not move during the construction and alignment of the rest of the frame system.


  • Preliminary acceptance must be carried out in advance between the site supervisor and the installation captain. This test to ensure the quality requirements, as well as the plan of repair, cleaning vs paint miles. This acceptance record must be signed for approval and saved in the general contract document.
  • The official acceptance is carried out with the participation of the investor’s representative. This acceptance record must be signed for approval and saved in the general contract document.
6.2.7. Construction equipment
Mobile machinery equipment
  • Mobile machinery including delivery trucks, cranes, hoists, etc.
  • Only mobile equipment that has been tested by skilled operators can be entered into the construction site.
  • Where there is a risk that mobile equipment may come into contact with electricity, all electrical wires must be fenced or flagged. Wires at risk of accident must be disconnected or safe before starting any work.
  • There must be no machinery operating directly on the electrical wiring.
  • Never operate machinery located less than 4.5 m away from the voltage source> 4.5 m. Only one person is allowed to give signals to the operator. Except for emergency stop signs.
  • Avoid going under or near an object being lifted.
  • All heavy loads that are hoisted must have a tag line to drive the object.
  • Before hoisting anything, it is necessary to determine the clear standing position of the crane and position of the crane in the construction area. Work safety assurance and possible risk analysis must be carried out (based on safety procedures in field installation).
  • Before material handling, the cranes must be located and the folding cranes must be pushed out. The length of boom, angle, operating radius and safe lifting load shall be estimated based on the manufacturer’s lifting diagram.
  • At all stages of construction, it is recommended to avoid or minimize the damage to the finished paint part of the material, by using a nylon cape or belt with protective gaskets where direct contact with the steel structure is made. or by using a cluster piercing nylon holes to lift.

Crane rope and rope suspension tie.

  • There must be a thorough inspection of the crane cable and hanging rope. Damaged cables and cords must be removed and destroyed immediately.
  • When carrying out cranes, avoid arbitrary hoisting rope. Need to protect the crane wire by lining the boils corner. Absolutely do not jerk suddenly when cranes, because sudden shock will increase the load 3 times normal danger to the rope.
  • When not in use, the cranes should be neat, never overload the crane.

Construction scaffolding

  • Must have a plan to use as well as install the construction scaffolding so that it does not hinder the movement of the crane and the arm span as well as not causing difficulties for the construction work. Always place scaffolding on hard soil or lined boards, at least 200x200mm.
  • Individual scaffolding must be caught in fixed structure with a minimum clearance of 1.5m. Each upper scaffolding frequency must hold tightly to the lower frequency with steel wire or scaffolding tube, so as to ensure safety.

Hand tools

  • All hand tools must have lanyard to keep from falling. Must use the device for the right purpose. Never use a handheld device for non-intended purposes. Never use temporary replacement devices.
  • Definitely never use broken tools, frayed or faulty winding machinery or without protective covers.
  • The device must be turned off and isolated from the power source, and there is a special warning when the sound of cleaning or adjusting the machine.
  • Make sure that the machine will not operate before removing the protective cap for repair or adjustment.
  • Must report all broken, broken machines … To the captain

Cut by Driftwood – Welding

  • Only skilled, properly trained and instructed personnel are allowed to use oxygen equipment, when welding equipment is burned. OSH supervision of the project is required to conduct an initial inspection and save the report before allowing its use.
  • All compressed air cylinders must be stamped and approved for use. Pneumatic cylinders should be handled carefully, avoiding collision, bumping or dropping. Always store the bottles in an upright position.
  • Pneumatic cylinders are moved by trolley, not rolled. When using a cage or cage, never use lifting magnets
  • There must be a safety cap on the compressed air bottle when not in use and in transit
  • It is necessary to take measures to protect against reverse fires with approved instruments to prevent the fire from spreading into the gas cylinder system.
  • Rock mines should not be used as hammers for welding or soldering scales.
  • Before burning, welding or heating, workers are responsible for checking the other side or the bottom of the object to be sure that all fire or damage hazards have been eliminated. A suitable fire extinguisher must be available.
  • Never heat a flat object on a concrete floor. It is important to ensure that there is an air space between the material and the concrete, otherwise the concrete will crack when the temperature is too high.
  • Do not leave the stone soldering iron in a closed container or container. Leaks can be the start of a fatal explosion.
  • Before leaving the workplace, turn off the gas tank by locking the valve on the front pipe and then the valve on the groin. Make sure there is no gas leak.
  • Conduct regular inspections of the entire groin, gas pipes, barometric meters and other combustion devices, and the barometric pressure gauge should be labeled according to the intended use.
  • Gas pipelines must be kept away from open flames and hot slag.
  • All air hose connections must use a screw-type connector. It is not allowed to use a fastener to fasten the connection.

6.2.8. Construction in special conditions

  • All construction works in special conditions must be planned, registered, organized, supervised and recorded. Construction works under special conditions are defined as jobs under the following conditions:
    • Flammable work using welding equipment, cutting using gas.
    • Construction during holidays or outside office hours.
  • Construction commander is fully responsible for registering and planning all construction activities in special conditions.
  • Steel building erection diagram